Well, the villain is Dr. Doom, so regardless of one’s personal feelings about Sam, Thunderbolts, etc., it was always going to focus heavily on the FF for this film once they decided to switch from Kang to Doom.
The multiversal elements in terms of characters appearing won’t be as heavy in this film most likely, they’ll save that for Secret Wars.
Also, their roster has no juice? I’m sure you’ll be dismissive of some of these, but they have within the Sacred Timeline itself: Thor, Hulk, Hawkeye (Clint and Kate), Sam/Cap, Bucky, Star-Lord, Ant-man, Wasp, Spider-man, Dr. Strange, Shuri/BP, Captain Marvel, Moon Knight, Ms. Marvel, She Hulk, Shang-Chi, Daredevil, etc. There will clearly be at least some characters that most particular fans can care about.