Storage space

You are welcome.

As IB6857 writes, you will need to offload some of your photos, for example to iCloud.

You can enable Optimized iPhone Storage. Go to:

Settings -> Photos. Put check in Optimized iPhone Storage.

When that feature is enabled, iPhones store your images in a lower quality and store the original in iCloud. It saves you a lot of space over time. However, it requires an active iCloud Storage subscription, as you only have 5GB for free, from the start.

You can read here how to upgrade your iCloud Storage Plan:

https://support.apple.com/en-us/HT201318

Unfortunately, it is not possible to manually clean up the "Other" category.

Other will be reduced when you restart and when you do a software update.

Fortunately, there will be a new update today, or tomorrow (iOS 14.5) so it might be able to clean up a bit.

You can already do a reboot now and see if it helps a bit.

Probably. Photos and Videos (mainly videos) take up a lot of space just because of the sheer amount of data they hold. Try offloading some or all of them to iCloud, this will free up some space on your device but will likely require a subscription to increase your iCloud storage plan.

Note: even before the update it showed that your photos were taking 31.04GB of storage.

Yes, 6000 images and 2000 videos can very easily fill 30GB. It's also about the quality of pictures and videos.