Which ones should I focus on leveling up? Which ones am I egregiously missing from my arsenal? What new dinos should I be looking to acquire in the future?
besides how much dna you can collect, level doesnt really matter. just hubt as much as you can in the right zones and feed your team very often. make it a goal to level atleast one a day. keep the team levels balanced and you should find success.
try to plan in the long term. Try to level up dino with an hybrid (for example the indominus to prepare indoraptor/erli) as it’s not a waste of resources.
short term rewards (ie overleveling a common) can be good only if you have the DNA to do it and a steady coins income
When there is no tournament around and an update incoming, stop fusing. You can still do materials for unique (like bringing indominus level 20 or unlocking a dino) but otherwise level up could be disastreous. Instead just gather DNA ready to spend once the new meta will come.
Advice on your team :
Your team is lacking of speed. While it can be a strategy, your team is not well suited to take advantage of this. There are 34 dinos faster than your fastest dino. That’s a lot ! It means there are a lot of matchup where you will take the first hit.