u/Desperate-Cut-9673

For the past month on June 1st, I started benching 225 lbs, 4 sets of 8 reps. I’ve had 9 chest days since, and so far I can’t seem to push any more reps in. I’ll try for 9 reps, but then my next set tops out at 7 or 6 reps, ultimately resulting in the same number of overall reps total. I feel like I should be doing at least 4 sets of 12 by this point, but my body just won’t cooperate. Any advice?
I should add that my rest time between sets is 45 to 60 seconds.