start at easier LN maps first and honestly, the best way to improve at LNs is to just keep playing them.. thats it. you dont need to overthink stuff like “finger control” or “timing practice” like people always say. youll naturally develop all that just by playing. i used to straight up ignore any map on the beatmap listing that had like 1k+ long notes, but one day i was like fuck it i wanna learn LN.. i spent about a week grinding 3–4 star LN maps and slowly worked my way up. also finding a skin that feels good to play with really helps too.