minimizing muscle loss in a deficit

so ive been on vacation where i gained a kg or two (it was a long vacay and i counted my cals so i know its no less) (for the record im 5’4 and used to be 55ish kg).
i used to be skinny fat but in the recent two ish months started going to the gym and strength training 2x a week. also generally became more active.
now after the vacation i want to go back to the weight before it so ill do a cut.
though i like seeing progress in my muscles and would hate to lose them in the cut and become skinny fat again (tho i lowkey am rn).
how big should my deficit be? if i keep training 2x a week