How do I actually stick to my plans?

Hello everyone. A few years ago I lost almost 35 kgs and kept it off for 3 years. Now.. I gained almost 25 kgs back and I feel like a complete failure. I know everything one must know regarding weight loss: importance of protein & fibre, strength training, taking walks, healthy habits in order to keep it off sustainably.. but I cannot seem to stick to my plans again.

I started a new full time job approximately 7 months ago which made me gain 15 kgs. 😔 I try my best to change my habits and eat healthier.. but I always end up comfort eating and eating stuff that makes me feel not so good. Please, I don’t know where or how to begin again. It hurts looking in the mirror.

What helps you guys actually be consistent in your weight loss while being stressed?

Much love and thank you in advance for advice.❤️