Hoping to fix my old sites!

Hi people. My name is TJ. I have several sites that I have been running and managing for close to 20 years now. I was making a good revenue stream from them thanks to ads but in the last 5 years, the traffic dropped and so did the revenue. I went from bringing in close to $8,000 monthly (from all sites combined) to not even getting $2,000. The drop happened suddenly and I have been doing everything I could to fix it. I ended up having to go back to office work in 2024 because I couldn't sustain my life on less than $2,000 a month.

I want to get my websites earning revenue again like before but no matter what I have tried thus far, nothing is helping. I am joining the forum hoping to get some advice as I am honestly at a loss. I have even tried asking AI and while the responses are good in theory, a lot of what it suggests just doesn't work.