Mate,
Before you begin thinking about aas and cycling, you may wish to consider having complete blood panels taken and specifically looking at your test levels. This will tell you two things:
1) your baseline test levels before you start cycling, a good thing to have so you can benchmark off it in the future if need be, and
2) see if you, like many others your age, have low T. If you do have low T, you may be able to get a Rx and optimize your T levels.
#2, if you do have low T levels, once optimized, should help you restart your gains.
Having said that, and not to come off as preachy, I'm doubtful that you have peaked (plateaud) in only two years. there are many that have very clean diets, and continue to gain for five years or more. The first six months you will see your biggest jump. The first year will be your biggest year. And then after that, it slows down. I think this is really where you are, in the slow down period, post first year. This is where the hard work begins.
Anyways, I'd suggest beginning by having blood panels taken, and see where you are at there.
Good luck!
---Roman