I second everything about hitting the gym, seeing a physio, and focussing on back and glutes etc.. but for some tricks and cues, I recommend getting a great cha

I second everything about hitting the gym, seeing a physio, and focussing on back and glutes etc.. but for some tricks and cues, I recommend getting a great chair that you love, positioning your screen slightly higher and maybe closer than you normally would, get a MS sculpt keyboard which positions your shoulders outward more comfortably, pretend you're James Bond or some badass woman when you're walking around, and position your car seat at right angle if you drive. Also tell your partner if you have one to poke you when you slouch, and think abiut squeeezing your abs when you walk