Most Helpful Guy
Keep in communication, trust each other, positive mindset, keep the romance alive, switch things up keep each other on their toes, make an effort to meet up somewhere if it's to much of a hassle to go to the other person's town or city then try to meet up somewhere in the middle, things like that.
Most Helpful Girl
I've never been in a LDR personally but if you're asking about communication advice maybe you could set up Skype dates and make plans to call one another every other night or something of the sort. The two of you could also try saving up and take turns visiting each other at least once a month or something.