I can't really give you a proper answer without knowing what the relationship issues are. However, these are 5 key points to follow if you want a healthy, successful relationship.
1. Be honest
2. Express appreciation
3. Communicate your feelings respectfully
4. Be loyal
5. Spend quality time together (without your phones on!)
There's a great article titled " 14 Ways to Keep Your Relationship Strong, Healthy, and Happy " that I think is definitely worth checking out! It has some great tips on how to keep your relationship growing.