About music matching time signatures

[Prestoch]

Hello. I am mired in doubts about how to use time signatures in my music correctly.

I would like to show you a fragment of my prelude (see attachments), mainly written in 6/4 and 4/4, but there are measures that differ from these (such as 9/8 and 3/4, even 15/16).
And I'm not quite sure how to put it all together in right way. I would hate to change the time signature from bar to bar. Fox example, in classical music, this is not such a frequent practice and tuplets and subdivided measures are often used there for such cases.
If you have experience, please tell me what to do best: use tuplets to shrink the music for a needed time, divide larger bars into small ones (but I'm not sure how it applicable for my particular case), rewrite music so that'll match the time (I would not want to do this because I like how it sounds right now), or maybe something else.

Thanks.

[MikeLyons]

Do what you feel you need to do to make your intentions clear to the player.