Disgusting HDHR farmer reporting in!
get good at nomod, your fundamental skills (reading complex patterns, rhythm sense, aim, accuracy, reaction time) all probably need to be way better, guessing by your profile, playing something you can play comfortably, but also pushes your limits is the best way to improve, not reactively playing maps that are too hard for you, it will all come naturally as you progress, it may sounds repetitive at this point, but play more, play a variety, and don't stop playing HR if it's fun, just don't expect to improve quickly by trying to brute force learn something you don't have the foundation set for. first and for most you need cursor control, aim, and acc, then worry about approach rates, because that will be all you have left to learn, learning to acc before you can read makes no sense, and learning to aim at circles off reaction instead of reading is going to be vastly harder than aiming at circles you understand thoroughly. Personally, I tried to brute force learn HR for 3 months with very little progress, dropped it got better at the overall game, came back and HR wasn't nearly that tough to pick up, and was vastly more enjoyable, now I basically never play nomod, unless it's high star rating or high base AR.
Sorry for not splitting up the wall of text into easier to read sections, but fuck it there's some advice in there.
Edit: I just re-read that and my go I must be tired, because there isn't a period anywhere in there. If any part of my tremendous run on sentence doesn't make sense I'll clarify, just lmk.