HELP!! I'm unwillingly starting over!!

Feel free to add! In a similar situation. This time I will do this and see this through! Not doing it will lead to more weight gain, and that's not something anyone wants when they are unhappy with their weight!

First of all you are not unwillingly starting again. You are here and that means you have taken the first step. You care enough to reach out for others. You should be proud. You can do this!

I've been yo yo dieting all my life. But now found a diet that really works, is easy, and theres absolutely no hunger. Low carb high fat eating. I'm full after every meal.

You are not alone. The statistics say that over 80% of the people that lose weight, gain it back, some gain even more than they lost, so you have a lot of company.
I am struggling to maintain my weight loss. It will be 3 years on 11/3.
What has worked for me, is moderation in all food. Paying attention to portion sizes and weekly weigh in.
I don't want the weight creeping up on me, so I cut back on calories when I gain more than 3 pounds.

As far as tips that have helped me start losing weight again...

The 3 main things that have finally made a difference & started to work for me:
•EAT ENOUGH PROTEIN (actually keep track in MFP, not just guess. I had to really make an effort because I don't instinctively eat much meat or other high protein foods. Weigh protein powder has been helpful to hit my daily protein goals)
•Limit carbs/sugars (not low carb, just not excessive carbs)
•Mild calorie deficit (if I go too low calorie I start to lose muscle and also get too hungry & end up bingeing every few days, so gotta keep it in a more manageable range)

These have also helped a lot:
•Manage stress, reduce where possible
•Drink plenty of water
•Little to no refined sugar
•Little to no alcohol
•Little to no gluten (or whatever foods you have sensitivities to)
•No fast food/junk food
•Weight lifting
•Body weight exercises/calisthenics
•Steady state cardio
•High intensity cardio
•Walking & hiking
•Learn to enjoy exercise!
•Rest & sleep enough (very important!)
•Get a scale that measures body composition- not just weight. Weigh daily first thing in the morning, track fat percentage & muscle/lean body mass - make sure fat is decreasing and muscle is staying the same or increasing.
•Remember fluctuations are normal but the general trend should be going in the right direction or something is off
•Get a food scale
•Focus on health not just weight loss
•Don't worry about slip ups, just keep going
•Take a multivitamin & fish oil
•Take supplements to correct any deficiencies
•Eat lots of veggies & leafy greens
•Add flavor to food with low/no calorie things like lemon juice, vinegar, salsa, fresh herbs, garlic, spices, etc.
•Follow fitness minded people on YouTube & Instagram to help stay motivated

Hope some of these tips help you too!

The mistake people usually make is dieting then going off the diet when they lose the weight. I'm not saying you need to diet forever, but research flexible dieting and when you reach your goals, go slightly below them then slowly, over the period of a few weeks, transition yourself up to maintenance calories. Once you get there don't stop the exercise you were doing, simply adjust your diet to match an exercise schedule you can continue long term. Then learn how to match your calorie goals without logging (by sight, volume, serving size, and by avoiding foods which you know to be heavy on calories. If you do eat something heavy on calories, log it, then exercise more the next few days to pay for it. Or, better yet, if you know you're going to have a day or two of high calorie meals (holidays maybe) exercise more before them and plan for it. Once you have that down to a science, then stop the logging for a while and try to maintain by watching the scale but by using the techniques that worked for you when you were logging and maintaining.