Worth r4 5* Venom?

I'm currently uncollected but not yet fully completed act 5, at the stage where I'll be able to have basically one 4/55 per class. Venom (duped) is currently my only cosmic 5* and I was wondering if it's worth taking him to r4 or if I should wait for a different cosmic.
This is my current roster:

This is my current roster:

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