I would recommend doing some no stirrup work. This will help improve your balance and your position, as there is less room for mistake when riding with no stirrups. What I’m trying to say is that without proper position, it is likely you will lose balance. You can also do some bareback riding and this does the same things as no stirrup work.
I know this probably doesn’t really make sense, but basically do some no stirrup work or bareback riding.
Hope this helps! 😄