Shuffle patterns relieve monotony:
Practice first with all 8th notes in shuffle..
Da da Da da Da da Da da

Once the chords are in your fingers, you will soon find other strum patterns with these chords.
DA Da da DA da da for example

Write in the fingerings that work best for you.
Note the "X" means do not play this string.

The transition chords will need more practice, which is why there are repeat signs around them as a reminder.