Here's something to try, but it requires thinking about the pulse of the song in 16th notes instead of quarter notes. So, as you count 1, 2, 3, 4 --- each beat gets 2 even downstrokes. So you would count the downstrokes as: 1 'and' 2 'and' 3 'and' 4 'and'.

Next, think about if you were to strum upstrokes evenly in between those downstrokes. Those upstrokes would be in sixteenth notes.

Now for the strum pattern:

2 downstrokes -- on the 1 and then the 'and-of-1'

then

2 upstrokes -- right after the second downstroke, then the next upstroke.

Repeat for the 3rd beat of the bar.

This pattern gives a bit more texture and adds some upstroke accents that give a bit more of a groove to the tune.

Let me know how it goes!

Mike