Tips to spice up our sex life?

My SO and I have always been a very frisky couple but once I got pregnant with our sun last year we rarely had sexual during the pregnancy (due to discomfort and size) and once I had our son almost 4 months ago we’ve had sex but it just feels routine like we aren’t as into it anymore...

Tips to help spice us up again? We’re open to pretty much anything as we’ve tried a lot😅

Also if you have any tips on getting my confidence back up that’d help as well... I used to be so comfortable with myself that I’d just spontaneously find new things to do but I’m not that way anymore🤷🏼‍♀️ TIA❤️