Mate your not training long enough to be worrying about making no gains, you probably are making gains but they aren`t as noticeable. Plus if you`ve been doing pyramid reps like 12,10,8,6 for so long it`ll not be helping. Do a month of say 4 sets of 6 reps then switch to 4 sets of 10 reps. You can also superset and throw in things like drop sets. Keep training mate it`ll come in time.