You could probably just use an extension that unloads inactive tabs from RAM, and maybe another that closes tabs that haven't been touched in over a week. Between those and an extension that closes duplicate tabs, it's pretty easy to get down to a sane number, no LLM required.

If a tab is important, you'll be using it more often than once a week. I have a similar rule with impulse purchases: anything I want needs to sit in the cart for 24-48 hours before purchasing. If I still need it, I buy it. Probably cut the crap I buy down by 75%. Steam? It goes on the wishlist (personally capped at ~50) until I can commit to playing and finishing it right then and there.