Great to hear you've had success.

[1] is an interesting paper which gives you some hormonal examples. Effectively when you try and lose weight your body responds by increasing the hormones associated with greater satiety and weight regain. And these change may persists for a while — this papers documenting the change lasting past a a year. This will very by person however so if you have something which works for you keep going.

[1] https://pubmed.ncbi.nlm.nih.gov/22029981/