Turbo Tax will not proceed without filling Box 5, 6, 7, yet they are blank on 1099-NEC Form that I received except Box 5 that has 0. Leaving them all blank doesn't help

Did you try to delete the entry and re-enter without the zero in Box 5 (as opposed to clearing it out later)?  If that doe not work, please post here again.

There's now an exclamation on all three boxes😭

Go back to your entries and delete the state name in Box 6.

@Jason-3