Who should I upgrade to 7stars?

Who should I upgrade to 7stars?

So I basically just returned after a long while, I remember playing some solo raids that took like 1-2weeks to switch, so I’m kinda new to the upgrades system + there’s a ton of new heroes so I just want to know if I should focus on any of these (on pic) or any other. I do have BWTD however I’m missing a gear piece and she’s 5stars so idk if it’ll be any good. My focus is to create more raid teams so I can help my league. Ik I should upgrade the gears too, many are around 40-50 max and only my top 3 have 60-75. On that note, any tip to upgrade gear efficiently? Thx for any help/advice/tip in advance!

u/SlayerX1470 — 15 hours ago