TBF Story content/exploration is a one-and done thing, and can you really call content sending characters on a expedition for 20 primogems? Don't get me wrong, some events were pretty cool, but most of them are just not.
I personally filled in the gaps with leveling all my characters... finished up recently. I have I believe 29 characters, all 80/90, 6/6/6 minimum. It's nice in this kinda of games to set up goals for you to achieve, this has been a goal of mine for several months now, so it feels fulfilling. Now I may take a break from farming the electro oceanid 24/7 and go for some artifacts for lots of characters that I want to try but don't have the gear.