Mould taking over bedroom

I am the only person in my household that has this issue as the mould only grows on one wall in the entire house…..my bedroom wall with the windows.

Because of this, and the fact that my wardrobe is attached to said wall, I lost all of my clothes last year. Fortunately I was able to get more but that was an expensive loss. I now keep everything on a rack outside of my wardrobe because of this and even still the mould persists.

The windows in my bedroom are poorly fitted and there are gaps that let in drafts, but the main issue is there’s no vapour barrier under the house. Does anyone have any advice in regard to dealing with this issue? Ive had a dehumidifier running before but that ups the power bill, I have to wipe the wall down with vinegar every couple of weeks, and I try to keep the windows open for as long as I can but in winter that makes my room near freezing.

I desperately need help due to being disabled and chronically ill (which got worse when the mould was bad last year). I don’t know what to tell the landlord or property manager but I need to get this issue fixed for my health and so I don’t lose anything else.

Any advice would be appreciated :)