I've had good results in the past getting through plateaus by doing a "week" (or however long ur split is) of drop sets. I do the same exact exercises, just 3 sets each, each set is a drop set (I drop twice, so a total of 3 diff weights per set).
Also if ur looking/willing to go the supplement route, I started incorporating bcaa's, 1 scoop before one scoop after workout (so 2 per day) and I feel like they actually do make a difference. Its weird cuz my protein shake already has bcaa's in it, but I don't know, somehow someway, it actually does seem to make a diff for me.
You could also try ditching the bench for 6-8 weeks and just do dumbbell press, then jump back onto bench, see if it made a diff.
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