As others have mentioned, dropping stuff you don’t actually read is a good idea. I’ve got two books that I haven’t read in the last three months, though in one case I’ve been holding off so that I could read a whole arc at once.
I’ll go one farther: If you ever find that you don’t like a book much, and you’re only reading it for completeness’ sake, or because you feel like you have to in order to keep up with the publisher’s shared universe, drop it. I used to get every big DC event comic, but I didn’t actually like a lot of them, and they just took up space. So I made a decision that from now on, I won’t buy events just because they’re universe-spanning. I’ll only buy the events that look interesting to me.
One more thing I’ve found helps is to start with “what if I could only buy one comic?” Pick one. Then “What if I could only buy two?” Pick the second one. Keep going until you reach the number that fits your budget. It’s a ranked list, but taking it one item at a time really forces you to think about the top of the list.