To make a chord progression a little more interesting, here is an idea for you.

Say we are going from C to Am. Take the fifth of the chord you are going to next, in this case E, and play the dominant seventh, E7. So the chord progression becomes C,E7,Am.

This adds another chord to the progression that fits well, even if the fifth of the next chord is the root of the first chord.
Example, C to F. So that becomes C,C7,F.

Billy