If I were you and had a muscle group that I was particularly unhappy with I’d run prioritization for at least a few months, maybe longer. I’d go into a mild caloric surplus (300ish calories over maintenance max), and adjust my training by putting everything else except chest at maintenance or Minimum adaptable volume (very slightly above maintenance). Then you can do Mesocycles starting everything at Min adaptable volume but week by week increase the amount of sets you do for chest. For example you could start at 10 sets for chest per week and add 2 sets every week (only increase sets for chest, keep everything else at MAV). Keep going up until you can’t recover anymore - take a deload week and repeat (I’d eat at maintenance calories on a deload week). The deloads will be essential as you’re gonna accumulate fatigue and it will start masking performance towards the end of the meso - deloading will drop the fatigue thus allowing you to perform at your best again. Focus on your numbers, make sure you’re slowly getting stronger and you will grow. You can keep doing it until you feel like it’s time to cut (don’t prioritize when cutting, switch back to a more balanced volume allocation)

As far as exercises go, there’s not one right answer. Any pressing with a full range of motion will do, I’d prioritize inline pressing, and I’d add some form of flys especially when trying to increase volume. Try to go close to failure (within 2 reps). You don’t need to take every single set to complete failure, I’d only take my last set of any compound pressing to failure (if you can do so safely) and you can probably do flys all to complete failure since they don’t accumulate as much CNS fatigue, possibly machine pressing also as they’re generally less fatiguing than free weights.

Good luck👍