I'm not sure what to say. To be honest I feel your pain so I'm the worst person to give a pep talk. I plod on some days because it's easier than taking a stand. 9 years in the hobby for me now too. Moving my tanks when I moved was the worst thing I could ever have done because I took one of the nicest tanks I ever saw and made it one of the worst tanks I ever saw. Three years later I still don't have the problems licked. I don't know what to fix when I don't know what the problem is. It's like a tank gets to an age and it just can't sustain itself anymore. At least some things do OK but I miss my tank when it looked like this:
It hasn't looked like that in a long time.
I try to remember to focus on the things that are working, but it's hard not to notice the things that aren't. At least there are things that do make it worthwhile still, otherwise the towel would have been thrown in already.
Hang in there for now. Things always seem the worst before they start to get better. If you need help, ask. We're in this together.