I have a rule. If something stays in my list for longer than a month, it's not that important. I would suggest you just remove it, but fear of missing out is a thing. So instead you can have a low priority todo list and move it there.

That problem can be turned into a boon. You have a better chance that there's something interesting on the list you actually want to do. Or important ones, or whatever you care about.

What about the ones you don't care about as much? Well, you don't care about them, so not doing them is not a problem.

An overlong todo list is a nice tool to help prioritize the valuable things.