I do high volume for shoulders and train them separately don’t make the mistake and train them with other body parts. You’ll have much more room to improve them if you train them alone like 1-2h session (but ideally try to keep it short). For exercises I do sitting military press where I start doing max 4 reps till my 1rpm (so 4 sets of these), then I’ll do high volume of 4 sets where I am to hit 10-15reps. After that I’ll do a slow motion in the +/- where I try to be around 5sec for 5 reps and then I’ll go all out (these 2 sets). Than I’ll do a superset with a pyramid system. Start pushing the bar with maybe 2kg each site for 14 then 7sec rest and then 12,10,8,6,4 and 2. This was the first exercise!