I think the issue with Meghan and cooking/lifestyle is that no one really associates her with those things.
The Tig was travel, eating out, bit of fashion, hotels, socialising. Light and frothy and great angles and photos, little snippets of a minor celeb lifestyle.
For an actual cookery, lifestyle brand to successfully launch we need to know this is "their life."
Meghan keeps saying she's a great cook but we've never seen evidence of this.
I thought we'd see little snippets and teasers on her new IG. Her cooking, some recipes, looking at ingredients, snippets of tableware at dinner parties etc.
Things that make you look and think "that looks nice, wonder where she got that, looks tasty, bet I could make that, or I'd be willing to try that recipe". That builds an audience and establishes your credentials in that area.
Jennifer Garner did it organically on her IG with her posting snippets of her successes (& failures) in the kitchen. Kitchen Aid started working with her, and she's never taken it further but she does now have an established audience as an amateur home baker.
Meghan has had nearly a full year to build her credentials and she's just allowed her IG to stagnate.
Edit - spelling. I hope ARO or whatever is a success for her because I think she needs a positive in order to move on, otherwise she's just stuck in a pretty negative post-Royal Family rut (that they both created).