Work on those mistakes on maps you think will be beneficiary.
If you got a problem with dashing for example, a map like Burst the Gravity or old maps in general is great practice as they contain alot of weird dash patterns.
Remember ze part you miss at. Expect it remember what it looks like.
Don't worry if you miss/break a combo. Just try to catch the part you're missing.
Play hard maps with difficult patterns that you can pass aim for a score or x amount of misses that you're happy with. Play it again from time to time see if you can do better that usually means improvement big or small.
Thats's how I find meself catching parts I wasn't able to.
All that being said I suck at jumpy maps..no matter how much I play. So if you don't improve it might just be one of those things.
i just downloaded every ranked ctb map (there really aren't that much. about 800 diffs in total.) so there's a lot of options to play. just try getting a few new ones and play other ones. you can come back to the ones you're stuck at later on and you should be better i guess. i personally preffer new maps because i feel like their mapping's more on point but if you really want to master everything then you can go with old ones too.