I think people really don't understand what a "push" means, if they think spin-off minis are enough.
The problem is that comics themselves are a very insular market. Simply by the way they are sold, the direct market is almost impenetrable to the casual reader. Say you were an eager young Panther acolyte in February 2018 who just watched the movie. You know he came from the comics, so you jump on Google and find your local comics store, a hole-in-the-wall place in a ratty shopping plaza.
Eyes wide, you ask for the Black Panther comic. You're lucky... there's one copy left. The cover says it's issue #170, part 5 of a story. The owner doesn't have the other 4, but can order it for you. You open the comic... and read this:
Your mom, looking over your shoulder, shakes her head at the "round and lush" bit. She asks the store owner if there's something a bit less "mature". He only has the first trade though... talked about how great it sold and the awards the writer has won. Your mom has actually heard of him (from The View) and he passes it to her. And this is the first page you both see:
You're completely lost. What happened? Why is Okoye mad at him? Where's the beginning of the story?
The store owner talks about Hickman and Time Runs Out and Secret Wars and explains you have to read all these older stories (only a few of which are in the store) to understand what is going on. Not that it actually matters, because the actual plot doesn't depend on any of this.
Mind spinning, you change your mind and decide to stick with reading manga.
Seriously, though: If you want to push a character, you step OUTSIDE of the comics. For most of my childhood, that was toys & animated cartoons, keeping the character in front of kids' eyeballs. Nowadays, video games are the biggest draw.
If you look at the history of Marvel animation, One franchises have gotten the biggest push: Spider-Man. Everyone else either hasn't had a series since the 60's (Cap, Thor) or only a handful. There have been NINE Spider-Man cartoons, with a new one expected next year!
So sorry, Panther never got a push. And now, it's probably too late.