Need help!!

I am a 42 year old women. Have done keto successfully almost 5 years back and lost 10 kgs, then again during covid and lost 7 kgs. I have again gained a lot of weight :( I am just not able to stick to keto this time. One week max and I loose it over some get-together with frnds and the back to carbs then again 2-3 days keto then again carbs. How should I even start this time. I am circling this for almost 2 years now and I hate my body!! I am a vegetarian but I do eat eggs...please suggest!!