Im not the best at giving tips but what i would do is keep doing maps you can do and improve on them, you get a better feeling on kz. But you should also try new maps and set goals like getting to a sertent part and if you get stuck, keep that spot in mind for next time you play the map and try to beat it then and see if you have improved in that kinda a skill. And if someone good or someone that can complete the map is online ask them for help, like how did you do this part, there is a lot of players that will help and show you.
But something i saw someone wrote here kz takes a long time to get "good" and you will have good day and also bad days.
One more thing do some jump stats to try to improve the strafes, dont go for a lot of strafe just try to get maybe 5-6strafe with good sync. That will take a far on many maps for a lot of jump. Ladders can be a hell but search on YT "nykan ladder tutorial" he shows how to do ladders in diffrent ways if i remember correctly.
If you see me online just ask me if you get stuck. ( Might be a big if i dont play that much but i play sometimes )
Hope you find something usefull inte this. xD
Good luck and keep jumping mate.