How do you work on a relationship as time goes on?

If you are feeling this way already and feel like the jump on your bones piece of the relationhsip is already not like it was, how do you think having sex is going to save it. It will be great and then in 3 months time you will post that it is boring. Relationships need to be based on mutual interest, spiritual interest, and loads of friends and doing things together. Talking about where you want to be in 5 years, helping each other achieve goals, and bettering each other. Maybe do some volunteer work together, giving always give you a feeling of being connected, and also allows you to apprecaite what you have even more.