Muscle will deteriorate after your stacked SARMs cycle finishes. You’re not going to be able to keep every single gain you make, unfortunately. It just isn’t going to happen. You’re going to have to put in a lot of effort to retain most of your gains, and it’s possible, but there’s probably still a portion that’s impossible not to lose.
When looking to retain your gains, it’s crucial that you keep up a proper diet and exercise routine. It’ll enable you to retain as much of your gains as you possibly can, and if you’re working hard enough, you should be able to stop rapid deterioration.
Your muscles, of course, won’t literally disappear overnight, but they’ll gradually grow weaker and less impressive unless you’re actively maintaining them. Even when you were on the SARM, the SARM wasn’t the one doing all of the work, so why would that be the case now that you’re off it?
Keeping muscle after SARMs is mainly about the individual, and whether or not they can keep up the effort long-term.