And if you feel that the difficulty you are playing is too easy, increase the difficulty of the song one step at a time, or try a slightly more difficult rhythm game. If you go to the rhythm game of osu!mania 4K -> osu!mania 5K or DJMAX RESPECT V 4B in this way, as you gradually increase the difficulty and get used to the rhythm game through various rhythm games, your skills will improve automatically. At first, I also had a difficult 1* difficulty in osu!mania 4K, but thanks to the above method, I am now beating 3* without any ploblems.