I have had gmail for decades.
The best thing I did recently was turn off the smart features, add a bunch of filters, and unsubscribe from stuff I was no longer interested in.
It was initially a shock to see so many emails I hadn't cared for, but an hour of curation, and it has been a delight ever since.
I did the same, turning off all AI and smart features (including those Primary/Social/Promotion tabs) made Gmail so much better.
I'm planning to move to another service provider though. I can't trust Google anymore.