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This pattern is used when playing a song in 3/4 or 6/8 time. You feel it like 123 123 or 123 456. Listen to the drum tracks before attempting.
https://www.loom.com/share/694a4a1106ff4488ace777168438e0c5?sid=680d5d90-58a0-4db1-9f8f-a26af8d5b2b5
Practicing with these grooves is the BEST thing you can do to improve your strumming.
Slow
Mid
Fast
Slow
Mid
Fast