It may sound simplistic, but it is one of the most important things that has ever happened to my prayer life: Just show up. Even if prayer is nothing more than a box to be checked off in our day, checking that box off is better than not doing it.
It is what we do in our other relationships, is it not? We do not always want to do the things we do or feel tremendous joy fulfilling our responsibilities to our friends and family. But we do them anyway. We call our friends every once in a while; make dinner for the family; ask our neighbor how she is doing. Why? Because relationships are built purely on those who show up and try to make it work. What we have may not be what we want, but it will never grow if we are never around to let it.