I won't give a specific solution.

What works for you ultimately depends on you; be it intermittent fasting, OMAD, cutting sugar and/or salt, simply eating less, working out, a combination of the previously mentioned, etc. but what I feel allowed me to actually lose weight (~50 pounds so far) was accepting that -- whatever you end up doing -- it's not temporary. It's a lifestyle change. You're just going to regain that weight if you return to the habits that brought you there in the first place.

Mentally, I also approached it as "one step at a time". Weight fluctuates for all sorts of reasons be it water intake, you just ate, etc. I didn't get discouraged as I saw the number go up and down a few pounds here and there, but continued to view every few pounds as a milestone worth celebrating (not with a cheat day, mind you). The general trend kept going down, I was getting and remaining healthy, and that's all I really cared about.