I'll give you my more complete thoughts on Ostarine, since you seem very interested in it.
First, I've never heard of anyone getting substantial results out of it. It would be WAAAY more popular if it actually worked well.
Second, yes, that's how PCT works. But the PCT process is imperfect. It's usually successful, but it's not always. And that's assuming you actually know what you're doing, rather than following the really terrible advice that's out there. PCT is, without a doubt, the most poorly comprehended aspect out there as far as PEDS are concerned.
But basically, here's what happens. You run an Ostarine cycle, and let's say you actually DO make some iprovements over, say, a 6 week cycle. Then it's time for PCT. So in PCT, you are no longer using the strength drug, and at the same time, your testosterone production sucks. So over the course of the 4-6 week PCT, you may lose all of, if not more than, the gains you made using the drug. That doesn't sound like a good time to me. Does that appeal to you?
It sounds like your diet MIGHT be ok. How many calories are you eating? How consistent are they? And what percentage of your calories come from protein?
My best guess is what I said initially, that your training likely sucks. You indicated that you weren't consistent with working out. That's why you have zero results. How many weeks out of that year do you think you actually trained?