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Great advise as forever i neglected the thumb placement on chord changes. I have corrected that but it would have saves a lot of time and effort if i had learned to reposition the the thumb when needed. This is also helpful for learning to use barre chords and palm muting techniques.
Many chord changes become easier if you develop a “guide” or “anchor finger that stays on the same string and fret when changing chords.
When I play the D chord to the 4 finger G Chord my my ring finger is my anchor finger. It doesn’t move. the same with Em to G. The index finger does not move from the B string 2nd fret during the transfer from Em to G.
Or C to F. the index finger is on B/1 for the C chord and merely Swings down to cover the open treble E string to form the 4 string F barre chord or stay on B/1 for the 3 string F chord.. There are a lot of other examples if you search them out. D to Bm or GM to the 3rd fret 4 string G. 5th fret Em to G or G to Em.
There aren’t any short cuts but if you practice these hints others and myself have offered it will keep you busy and off of the mean streets… it will help you.