Hey Kayenm!
Sorry to hear about that, Iāve been there myself more than a few times.
If youāve already looked in the Recently Deleted Notes folder and online at iCloud.com, AND youāve recently tried restoring them somehow online:
It is possible you store Notes on another account, such as Gmail or Yahoo, etc. if you go to Settings > Notes > Accounts or Settings > Apps > Notes > Accounts, are there any other accounts you can turn Notes on for?
Even in a those settings you can look for an On My iPhone option, perhaps turning that on will restore them.
Otherwise, an awesome article to follow is this:
Archive or make copies of the information you store in iCloud - Apple Support
It may not help now, but hopefully in the future.
On another note, IF the notes were in fact stored on āThis iPhoneā and not syncing with an account, you may be able to restore your iPhone from a backup:
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
Otherwise, have you ever had these Notes stored on any other devices? Such as a Mac or iPad? If so, you may still have a chance to recover them, just let me know and Iād be glad to provide some more steps!