Checkout my strumming course: Strumming 101
If you like indie music chances are you've heard this pattern 1 million times.
P (pm) .ipm (hard)
P (pm) Pipm (easier)
https://www.loom.com/share/c60d76740f784815b1b740a9810968c2?sid=ccbd635e-d423-4006-9a87-a780703cf070
Practicing with these grooves is the BEST thing you can do to improve your strumming.
Slow
Mid
Fast
Slow
Mid