Good on you for recognizing and making some positive changes! Lots of folks don’t even make it that far.
If I can offer one bit of advice, try to focus a little less on the outcome and more on the process. It’s fine to set goals and challenge yourself, but weight loss is ultimately the result of a bunch of smaller changes. And lasting weight loss is the result of those being permanent changes to your habits and routines. Almost anyone can go hard at the gym 7 days a week and go down to eating once a day, but setting yourself up for success the next time life gets complicated, getting into a better relationship with food, and such also needs to be a priority.
I’ve seen the suggestion to think about getting these new routines into the same condition as brushing your teeth, even when you don’t really want to do it you do it anyways.
You can do it!
I started OMAD at 28 and now I’m 31. Down 130 pounds and trying to lose 20 more. Like you, I’ve been overweight a large majority of my life. The last time I weighed what I weigh now (180), was in 5th grade!
Keep it up and stay consistent. I don’t allow myself cheat days as even after years of OMAD, my binge eating habits will appear if I allow myself anything more.