I'm over 2 years in and have gained nothing back. I don't exercise and I just stay on plan and it's been effortless to maintain my weight.
I would like to see more bodyfat loss, about 5%, but I'm not really working at it at this point.
I lost all the weight within 4 months but have continued losing bodyfat since then even without scale weight loss.

I wouldn't consider myself a "keto-lifer" either. I've been maintaining my weight loss for over 3 years via some form of low carb when compared to SAD and MFP's default macro allocations. Only 1 of those maintenance years would I consider keto.

OP you have a long history of losing and gaining from what I read in your profile. Now you have the known complications of insulin resistance and prediabeties. (It's public. I'm just providing a response based on info you have provided). From what I have read, many folks have been helped with their medical complications via keto. I know from personal experience that keto helped me with the hunger I experienced during 2 years of non keto maintenance. It also helped me with the horrid cravings for sweets I previously had. Perhaps keto will be your key to long term maintenance and the roller coaster ride will end. I think I understand your interest in it.

What keto helped me with the most because of the diminished hunger: it allowed me to actually see that I had a habit of eating for many reasons other than hunger. I often caught myself standing, peering into the refrigerator or pantry to find something to eat, just to eat. I no longer eat during TV commercials. Hardee's billboards no longer entice me and cause me to exit the freeway. Ads in magazines for "XX" no longer prompt me to eat. I no longer eat as a transition from washing the windows to commence vacuuming the floor. You get the idea.

We live in a world of intentional inducements from food manufacturers. I don't fault them. I That's their good marketing department doing what they're suppose to do. I just don't succumb to their ploys. Food is a primary part of my social activities. I've had to learn to focus on the event and not the food. Keto helped with that. I can enjoy a football game or a movie without eating or over eating.

I currently don't focus on being in ketosis. I eat about ~50 total carbs per day. I might be in ketosis. I'm generally not hungry and generally don't crave. That's what I care about. Very low carb has made maintenance easier for me. I don't have to be in ketosis. YMMV especially with medical things involved.

If I continue to maintain, it will be because I pay attention to what I eat (macros), how much I eat (calories) and because I practice eating behaviors conducive to weight management (moderation)? I could waaaay over eat "keto foods" despite not being hungry.

Sorry so long. Many of my posts are. Gaining control over my excessive eating has been more than macros.