How do you deal with Anki cards after exams/terms, for long-term retention?

During the year I have decks for each subject which also helps with exam revision. Now that the term is over I found that I want to long-term remember some stuff but not everything.

One option is that I could just suspend cards I don't care for. Although, there is also some overlap between different courses, so I am also thinking that rearranging them by topic rather than course title might be better, but I am kind of afraid to rearrange my carefully put together decks. For now, I use tags and filtered decks. This has a disadvantage that I cannot directly add new cards to them as I could with a normal deck. It's also a bit cumbersome as I need to rebuild the filtered decks every time I tag cards.

How do you all deal with your cards after exams? Do you reorganize them? If yes, how do you do it?