What to do with paint leftover on my palette

I find myself not wanting to throw away paint when there is a substantial amount left as I have just reached a plateau of a piece in which I am working.  Oils you can revisit but Acrylic your time is brief.

Just as my Tutor when I was in 3rd grade said….. always comes to mind.  There are no mistakes in art.

I had dropped my brush with a dot of red in the middle of an ocean scene with a boat.  She very quickly picked up my brush & created a tiny flag on the mast.

I look at my leftover paint, not wanting to waste it & quickly whip out something unplanned.  Sometimes it turns out very well