As a leaderboard player of solo skywars in java I can tell you that you always have to choose a map since there are maps where you win faster than in others, anyway making 30-40 wins per hour means more or less not losing just one victory in an hour which is impressive. Another advice I can give you is to be persistent, that is, put a minimum number of victories that you can do per day and try to play every day taking into account that you can make a minimum of 30 victories per hour It would be a matter of a short time before you reach the leaderboard.