Fresh 90, little lost. Any advice?

I haven’t played for a while and I’m unfamiliar with the current systems. I hit 90 two days ago and finished the campaign unlocking all current content (I think) and I’m doing a world tour quest.

Do you have any advice on what content I should prioritize for my main? Should I be focusing on gear even though 12.1 is around the corner or should I complete any dailies/weeklies and advance activities like delves? Any advice is appreciated.