You really have to avoid getting into the trap of messing too much with things that aren't broken. If something is working, why not just keep doing it? Switching things up is not a good thing, it leads to lack of progress.
A little anecdote here. I know a guy, we both started lifting around the same time which was appx ten years ago. He was 180 lbs and around 18% bodyfat, I was 140 lbs and about 8% bodyfat. He did two cycles, quit midway through his second cycle to try HIT or something because he was bored, continued switching programs and is now into crossfit. Currently, he is around 180 lbs and probably about 18% bodyfat. He looks exactly the same as ten years ago, just a little older. Training ADD is a terrible thing if you want to make actual progress.
Meanwhile, I've done HST for years and peaked at 100 lbs heavier than when I started lifting, currently only 80 lbs heavier than when I first started lifting.