I’m no expert, but I had good strength gains when I chose 2 opposing upper body exercises (pull ups and dips) and did them 6 days a week for 5 sets. I made sure that I never went to failure and left big rests between sets so I was never fatigued. Went from 0 pull ups and 1 dip to 5 pull ups and 8 dips in under 2 months.
I’ve also started doing grease the groove on bench pistol squats this week (broken finger). Been doing 10 sets of 5 on each leg throughout the day. Still feeling fresh at the end of the week and I can feel them getting easier everyday.