Stopping breastfeeding

So my baby is nearly 5 months and last week I ended up in hospital due to gallbladder issues and was unable to feed her due to pain and i didn't want any medication to cross to my milk

She takes formula perfectly and still goes back to boob fine but due to me going back to work soon and an upcoming surgery ive decided to go bottle full time due to breastfeeding causing lots of issues

So my question is, how did any of you dry up your milk supply?

Ive been pumping little amounts when engorged, just enough so im not in pain and its a little squishy in hopes that my boobs will stop making so much milk

It takes basically all day to get to the engorged point anyway but to avoid just going cold turkey and ending up with stretch marks or an infection ect, how do i stop?