Relationship Advice F/21 & F/20

Do any older lesbians or lesbians in general have any relationship advice? A little background: lack of communication, understanding, and common interests seems to be hurting us more than healing us even though we both expressed our tiredness of arguing over the little things and dragging out fights and turning something small into something big. I’ll admit that it’s mostly me who causes the issues because there’s some growing up that I have to do. So I was just wondering if anyone had any advice to give in order to achieve a healthy and stable relationship.