If you haven't already done this: wipe all the apps and run the cache-cleaning or whatever it is in the system menu. That should get it back down to where the memory and storage aren't at 100% and fixes most of the problems. I've kept my 2017 Samsung usable that way. Also, if you have a pi-hole you can set it to use that as the DNS and block the advertising domains, retaining most of the smart functionality without all the crap.