How to repair a relationship?

My and a longterm boyfriend split for a week. We gave each other space, and then spoke about trying to repair the relationship. I've never tried to repair a relationship before, if its broken down I've typically realised its not working, walked away and moved on. But there is something here worth saving.

I haven't told anyone yet because I don't want other peoples opinions to affect the relationship. Whether they like him or don't like him.

But any advice on how to be a better partner. From how to be more supportive, more attractive, how to make him more interested, or how to make the relationship interesting and how to make sex more exciting. Just literally any advice to help me repair this relationship.