The Midwest will take over

I like the detail of this map better, though it is still overly broad (not accounting for AAVE or other minority groups, and not differentiating on age): https://aschmann.net/AmEng/

Not a map, but if you want better spoken examples of various accents and dialects, this is a great source: https://www.dialectsarchive.com/united-states-of-america