Work as a Team
Since both you and your partner are involved in your sex life, it makes sense to address any sex-related concerns as a team. Marin suggests having a mindset of "What can we do together to make sex more of a priority?" This also means no one partner is to blame for the issues and no one partner should be responsible for changes. If only one of you is initiating sex, talk about that and see if you can't be better about working together.