Personally, I haven’t noticed a regain when returning to low carb, but my most recent major diet change was to a healthy semi-low carb plan. There are new versions of LC, and carnivore has its fans as an elimination diet, though switching from vegan to carnivore might give your metabolism and digestion whip-lash.

You listed your plan as "Healthy Living" which is what many dieters are now seeking, more balanced nutrition. A focus on Diet Quality rather than pursuing Macronutrient Extremes. Both very low carb and very low fat can work for weight loss, but is it healthy and sustainable? Carbs lower than 15-20% cause many people to experience "carb hunger" and fall off the LC wagon.
Two other new popular approaches are in the Semi LC forum: https://forum.lowcarber.org/forumdisplay.php?f=138

I use both TheP:EDiet and Optimising Nutrition, my Success story summarizes how they worked me https://forum.lowcarber.org/showthread.php?t=484995
It is worth your time to catch up in the News forum and General Low Carb forum. Short-term regain may be shifts in water weight, longer term may be increase in lean mass, but in the fullness of time, you will need an energy deficit to lose weight. If you want to lose fat, you need to control your appetite by finding a way to get more nutrients per calorie from the food you consume.


Welcome back, all the best