I lost my butt what ways can I get it back? without all the crazy working out?

i used to measure 32-24-39 and i lost my butt now i measure 32-24-36... i never worked out and i still eat the same food i always ate but lost my butt... I don't know why maybe it was because i got depressed over a heart break or maybe because im always sitting down
I lost my butt what ways can I get it back? without all the crazy working out?
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