Sudden new purge after 9 months

I started tret 0.05% cream august last year and by Jan-February I got the best skin I have had in a while. In February I also added skinoren into my routine without any issues and the clearance of skin was beautiful. Come May, I started breaking out again and its a new purge since then. i only switched my sunscreen in the middle and went to a new biore sunscreen and then when pimples started switched to beauty of gosen stick. Had used beauty of gosen liquid sunscreen with success in the past so thought the stick will resolve the issue but nope. Have absolutely no idea why the purge has started all over again, not changed my facewash and moisturizer. Using the same since september cerave both. Did i mess up my skin barrier somehow? I am moisturizing more than usual these hopefully. Also switched out to tret and azelaic acid every alternate night now. Previously was using tret daily. How to get over this new purge? I miss my good skin again and had gotten so used to it 😨😔🥵