In a rut??

So me and my bf have been together for almost 2 years and we recently had our son 3 almost 4 months ago and since I’ve personally felt that our sex life has been boring and just repetitive. I’ve spoken to my bf about spicing things up or trying new things and I’ve asked him if I could do anything different that he would like or improve on anything and he always just says ‘yeah we can’ and then that’s the last I will hear of the topic. Yet when it comes time to do anything (which isent ever a lot of time) it’s always the same things. I’m growing super tired of it and need things to change. Does anyone have advise or tips of things to do?? Please I’ll do anything at this point 😩😩😩