My husband and my sex life has started becoming so routine how do we spice things up?

Talk to sex therapis. Or discuss together u expectation and what make u feels better.
Work at it. Depending on how long have you been together or whether you have children, you can have date nights. Take time for each other, spend time on the foreplay and the excitement phase rather than proceeding quickly. Know what each one of you likes and spend time focusing on satisfying your partner rather than yourself.