Just ride without a saddle/bridle from time to time ;)
I sometimes got very bored with my discipline so I tried dressage for a bit and it actually got me very interested but if flat is too boring cross country is super fun as well
There are many different things to do in English so you could experiment which you might like and also give western a chance because it could be a good fit
Maybe try different things within English like dressage if you do show jumping etc also try giving western a chance you never know. Remember the real reason you started riding maybe that will excite and push you :) best of luck!