To really improve and break the wall I think I should try something else : editing beatmaps to copy paste that pattern X20 so I can practice what exactly is causing me to fail.

Do anybody else tried this ? I know endurance and reading come with playing but I'm getting really upset failing beatmap at 85-90% acc because the beatmap go crazy for several seconds

Too lazy to custom edit. I practice my skill collection regularly instead.

I practice with nofail so that I can play the entire section that kills me. I feel that getting kicked out of the song the moment you fail makes it very hard to actually practice difficult bursts.

At lower levels, reading improves a lot with experience with difficult or awkward patterns, and one way to experience those is to use random, although this is a bit less useful in 4k.

you should figure out exactly what your problem is. Is it reading? If it's reading, you might want to try increasing your scroll speed, since that will stretch the pattern out and make it less visually dense.

If it's speed, practice fast songs in general more often.

If it's specific kinds of patterns, find songs with those patterns in them. practicing maps that consist of just that pattern can help, but part of the difficulty of certain patterns is how they transition from and to others in the song. For example, part of what kills me on jinjin's haelequin is a transition late in the map between 2 different kinds of patterns. I can play both patterns fine in isolation, but when transitioning between them after a stamina heavy map, it's completely different. In this case, the only real way to improve is general practice overall, or other songs with similar transitions if you can find them.

You can also try what i consider "intensity training" which is how I improved for quite some time in mania. When I started, I basically only played songs I had to use nofail on because they were flat out too hard for me. The key to making this kind of training work is that you need to get past the reflex to just mash without thinking first. I still mash, but I mash intelligently, trying to hit something similar to the pattern even if I can't hit the pattern legit. After a while of that kind of practice 2 things should happen. Difficulty spikes in easier songs shouldn't seem as bad since you spent all that time playing stuff that just wrecked you. The second thing is that you should be able to hit those bursts better than you used to since you'll have overcome the reflex to mindlessly mash.

i use from time to time Half Time to better understand whats happen in this burst becaus i dont can read anything(mindeblock) and than i try to remember the patterns and practice them on normal speed

I just play a lot of unrank maps that are difficult without nofail and don't retry the same map repeatedly.

Personally, I feel like the best results come from playing a variety of maps consistently. Try playing easy songs, and hopping to the difficulty a little above your level to help you get used to being a little more "accurate" while practicing patterns at a high speed.

If you want to learn to read, in my opinion, it is best to play songs that you can easily read and inch up in difficulty. From my experience, starting with a song that I can't even come close to reading only makes it that much more confusing. I usually like to warm up on Stepmania (for 4k) with easy songs and then move to songs that I can only get a low A on when I move to O!M. I feel like it helps me read the notes, and fingers feel like they're cooperating. That's just me though.

Not even sure if what I wrote made any sense. I'm pretty tired right now.

Just stick with what you're not comfy with. It'll come eventually.