I have done over a year of keto on two separate occasions and found it VERY easy to maintain. I contribute this to a high level of satiety while consuming foods high in healthy fats and protein. I rarely had cravings. My go-to fat is coconut oil which I put in my morning coffee and can add to just about any cooking and soups (coming up on soup season so bone broth and coconut oil is my go to). Just about anywhere you go out to eat you can find something that is keto-friendly. Anecdotally, during both of these stints I did not need to take my long term asthma medication and my frequency of use for my emergency inhaler was considerably lower.

I did keto for almost a year, and it wasn't that bad. My wife lost 50 lbs and I lost 45lbs. 190 > 145 (I had to put on weight afterward). First of all, you can eat things you enjoy, and you don't have to limit your intake. Basically, eat until you're full. When you're fully in ketosis (~2 weeks) you'll naturally not feel hungry. This is what makes keto great because you're never in a situation where you're hungry (at least after a few weeks).

Eating out isn't as bad as you think when in that position. Get a steak with some low-carb vegetables on the side. You can still have blackberries and raspberries and if you really need to "cheat" you can find some deserts that are no carb. Although best to limit those types of sugars. Use an app / website to track carbs for the first few months.

Just remember you're either in ketosis or not. There's no such thing as a "cheat" day on Keto as going over carb amount can kick you out.