Welcome!
My hair typically starts out pretty nice. My signature picture is the day after washing and after having slept on it (and it was a hairtyping picture, I believe, so not "all its glory" LOL). Yes, waves and curls do sag the longer you leave between wash days.
I weekly wash, for instance, and by Sunday, it's pretty much a body wave.
Do you use any styling products after washing? If not I'd try and look at the LOC/LCO method (linked in my signature). It's a great place to start sprucing the waves/curls up a bit.
HTH!
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