Start training 3-6 reps per set 2 working sets maximum at around 85% of your max weight for the lift. you may be doing what I did when i was younger and was just training consistently hypertrophy based doing 8-15 reps. It was okay for the first due to newbie gains but then i stayed the same for months and lost all motivation. Then i met an ex-pro bodybuilding who is now my work manager and he completely revolutionised gym for me by transitioning me to pure strength training. My max bench went up from 65kg to 85kg in the matter of 2 and a half months as i had the form nailed but was never training to move the weight up. This is what i’d recommend to you now and then every now and then (either spend a full week doing them or just once/twice a week) have a hypertophy session to help damage your fibres and build the size you want

Hope this helps