don't play all the time! Choose your lines, select those music phrases where the singer is NOT singing - or when you can lay down a complimentary line that does NOT interfere with the singer.

If you will be doing a break, or someone is doing a solo - yuo can build your 'fills' on the melody of that solo. Hopefully, complimentary to that solo (you don;t want to steal the thunder) - maybe a harmony to it, maybe repitition of a small phrase of that solo.

Basically you are trying to compliment and support the melody of the song. Too much playing can take away from the song. Start in the second verse, after the melody is established. Alternate lines. Play short lines. Play some long lines, but do so selectively.

This is an artform unto itself.