your disk is almost full #duh

There are no macOS viruses so just forget that idea already.

There are no 27" MacBook Pro desktops either, so some more information would help.

suggestions?

Optimize storage space on your Mac - Apple Support

Using EtreCheck - Apple Community

Preventing Disk Full Error

First: Get Correct Storage Information: Do not use the information from the Storage section of the About This Mac dialog. Ignore the Storage information as it is typically wrong. To find out the correct information for any disk: Select a Desktop disk icon. Press Command-I to open the Get Info window and look at the topmost panel displayed. You will find the disk information displayed for Capacity, Available, and Used. If you have more than one disk/partition then repeat for each one on your Desktop.

Second: be aware of available storage space. You need to leave at least 20GBs of free space on your startup volume.

Third: get rid of files you don't need by deleting them or storing them on another drive so you can remove them on the startup volume.

How to Free Up Space on The Hard Drive

1. You can remove data from your Home folder except for the /Home/Library/ folder.
2. Visit The XLab FAQs and read the FAQ on freeing up space on your hard drive.
3. Also, see Freeing space on your Mac OS X startup disk.
4. What is 'Other' and 'Purgeable' in About This Mac?
5. Files That Make Up the 'Other' Storage Category, and How to Remove Them
6. Free up storage space on your Mac.
7. See Where did my Disk Space go?.
8. Be sure to Empty the Trash to recover the space.
9. Replace the drive with a larger one. Check out OWC for drives, tutorials, and toolkits.
10. Use OmniDiskSweeper or GrandPerspective to search your drive for large files and where they are located.

Fourth: if you cannot delete files or put files in the Trash without errors then that means your drive has been corrupted because you over-filled it. You will need to erase the drive and reinstall macOS. I'm afraid you will lose all of your data if it hasn't been backed up already.

What Happens If A Disk Becomes Full

Allowing the disk to become full causes the directory to become too corrupted for repair. The current directory space was too small for all the files you were saving. In order to enlarge the directory, the OS must assign existing and contiguous space for a larger directory. But there is not enough space available for this. So, the operation fails and leaves the drive in an abnormal and unrepairable state. The only "fix" is to erase the drive and start over. You cannot backup your files first nor can you delete files to make space. The disk is FUBAR. If you don't have your data backed up then it will be erased and lost.

What do you do? You must reformat the drive using Disk Utility. If you are fortunate the Recovery HD is still bootable:

Install El Capitan or Later from Scratch

If possible, back up your files.

1. Restart the computer. Immediately, at or before the chime, hold down the Command and R keys until the Apple logo and progress bar appear. Wait until the Utility Menu appears.
2. Select Disk Utility from the Utility Menu and click on the Continue button.
3. When Disk Utility loads select the target drive (out-dented entry w/type and size info) from the Device list.
4. Click on the Erase button in Disk Utility's toolbar. A panel will drop down.
5. Set the partition scheme to GUID.
6. Set the Format type to APFS (SSDs, only for Mojave or Catalina) or Mac OS Extended (Journaled.)
7. Click on the Apply button, then wait for the Done button to activate and click on it.
8. Quit Disk Utility and return to the Utility Menu.
9. Select Install OS X and click on the Continue button.

Modern Mac operating systems use the APFS file system. This file system has a built-in backup feature called "local snapshots". When you delete a file, it will not automatically erase it. Instead, a local snapshot will hold onto the file. Eventually, local snapshots are deleted. When the last local snapshot that has a pointer to your file gets deleted, the spaced used by that file will become free again.

If the operating system starts to run critically low on hard drive space, it will start deleting local snapshots early. This should free up storage space by finally deleting that file. But this process does not happen immediately. You will likely get some disk space warnings first.

To complicate matters, when you check to see how much free storage you have, you may see it referenced in terms of free storage "available". This is not actual free storage. This is a representation of how much storage could be make available, by deleting local snapshots, for example, if the operating system really needed it. You can use Disk Utility to get a more accurate picture of how much actual "free" storage you have.

If you are running low on free storing, you are never going to make any headway by freeing up storage in single-digit increments. 8 GB is nothing. What can you do to free up 80 GB? That's what you need. Turning off WiFi will not help. Please do not use any kind of "cleaner". Those will scramble your system.

You may be able to recover space by deleting more files. Or you could move some files that you rarely need to an external hard drive. Note that Time Machine is a backup system, not an archive. If you delete a file, it will eventually be deleted from your backup too. If you want to save a file forever, you need to archive it to a separate, external hard drive.

Another option would be to purchase Cloud storage and move your files there. For iCloud, all you have to do is turn on iCloud Drive, perhaps enabling Desktop & Documents. Then any file on your Desktop or Documents folders will be automatically moved into iCloud. Eventually, this will result in more free space locally. There are tricks to speed this up, if necessary.