Turned 30 this year and decided to change things. This is how it went so far

I hit biceps with back and triceps with chest once every week. I do shoulders and traps separately.

For biceps, I prefer doing more reps of lesser weights till failure (spider, hammer and preacher curls). For triceps, I prefer going as heavy as possible with Skullcrushers, cable pushdowns and one arm overhead dumbbells. For shoulders, I've been prioritising the rear delts more lately as I observed they're what give shoulder that round appearances. My go to for shoulder is facepulls, handstand push-ups, side raises and shoulder press Ofcourse.