Next step in my 7* roster

I’ve taken a break from the game and I’ve started to play again. Which 7* should I focus on ranking up for general progression?

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What is your progression level? What content do you want to focus on now that you're back? Story? BGs? Epoc type content to get ra

That info would be helpful so people can give advice.

I’m valiant rn, I’m probably looking to get into hater content like crucible or necropolis