She was successful as an actress and with The Tig. I wonder if the problem is that she is now trying to live in two worlds, celebrity and royalty, that are completely different and which don't really go together. I think she needs to pick one, well actually they already have, so she needs to let the other one go. Which is probably impossible with Harry expecting to be treated like a senior royal wherever he goes. He really is a bit of a liability.
Yes they need to let the Royal one go, which is what they said they wanted to do. I think you've hit the nail on the head that Harry is the problem he can't let it go because then he is just a.n.other celebrity, what is he if not Royal? Nothing special compared to the other celebrities which abound in the area they live and Meghan was never A list anyway, the Royal status pushed her up to A list type status when they were working Royals now they are not they've lost the stardust that brings.
They should stand on their own, drop the shoe-horning in of Royal stuff but I fear they've missed the boat on that, they should have done it at the start. Their quasi Royal status is becoming tired and people are losing interest fast, they've sold the tale of woe people don't want to keep hearing it.
People, businesses, charities, etc., who want a touch of Royalty are not going to be knocking on Harry and Meghan's door. They know this and that is why they were so desperate for the half-in/half-out model.