Vagina tearing during sex

I’m 31 and have been with my partner for 5 years. In the beginning of our relationship, we could have sex in many positions. Then somewhere around the 6 month mark, we could no longer have sex without pain because I kept tearing and it would hurt with penetration. The lube helped to some degree because I am also dryer now. I really want to have spontaneous and varied sex but can’t due to requiring slower penetration to reduce injury. We only rely on two positions and those still cause injury. Anyone have any techniques they used to help make the skin near the vaginal opening more relaxed to prevent tears?