My best advice would be, to learn every damned mainstream chord between the nut and the third fret, and that includes barres!
There are not that many really good numbers that you can't play, if you master them, that you can't find there.
I was a kid in the fifties, (UK) brought up on the Everlys, Buddy Holly etc, but, little more than the three chord trick wet through?
Write them down, and just practice going from one to the other until your fingers do it automatically? I practised on 'Peggy Sue', but, it taught me agility?