Well, it's a tight niche of a role that kinda cuts down the number of people eligible.
Who says that Marvel needs a character that is anything like Wonder Woman?
Seriously, they have so many better characters that could be a breakout hit.
Peggy worked out just fine. Widow and Scarlet Witch have been at the very least functional cast members with a sizeable waifu crowd.
Polish Sif a bit and she could be an important player.
Hell, you could rope a blank page like Angela into the job!
Badass angel/Asgardian headhunter with a mean temper and no concept of social norms?
That's like Wonder Woman cranked up to 11 at least.
You have the question of her royal heritage (and possible claim to the throne), her relationship with her dear, newfound brothers and the Guardians as pieces already in place.
From there you can play her as intimidating or goofy as you will.
Or do both. She walks into one social pitfall after another but nobody dares so much as blink. And then you have a scene where Thor tries to teach her about how humans work but he got half the stuff wrong, too.