I never had loads to lose, but my story might be worth sharing because what I have done is to maintain weight loss.
I had always been 9 stone something until my 30s, then put on weight to over 11 stone, worsening post kids (5"4 if that helps). I am sporty/muscular and I think because I knew that and wasn't weighing myself, I kind of kidded myself I was ok fatness wise.
I just realised at the start of my 40s that I needed to actually confront reality. I'd half heartedly tried to slim a bit here and there, but tailed off straight after losing it. However, I just realised one day I needed an objective reality check about my health
So.... I got a Dexa scan, and from then on realised I need to weigh myself regularly, and now keep doing so.
The Dexa scan showed that I am indeed highly muscular, but carried fat in a dangerous place (my stomach). The scan frightened me just enough and gave me a very target specific weight at which I would be still be muscular and toned but with a much better body fat (9.10). This was a healthy, realistic reset because I think in my 20s, I had the idea I 'ought' to be 8 stone odd, which is too light on my apelike frame!
Getting on the scales regularly meant and still means I could see if I was in fact that weight (sounds obviously but I was previously very avoidant). To get there I just adjusted calories on myFitnessPal and ate a fair bit of soup. I got there over 6 months and have maintained since (nearly 5 years). I exercise (that never my problem though) and have just naturally adjusted portions (there's nothing I 'don't eat') and I now find it straightforward to maintain.
In retrospect I can see I was simply eating overly large portions - a treat breakfast might have been two croissants with jam whereas if I fancied a croissant on a Saturday these days I'd have half or one, and there's no way I'd even want more. It really was that simple!
Never had that so called 'body tries to regain weight thing', it feels like 9"10 is a set point weight for me now.