Help spicing things up

Both in early 20’s. Going on 3 years of marriage. Everything is perfect except our sex life. Husband has a demanding job (55-60 hours a week in a factory), so he never wants to do it. I’m going crazy over here honestly. We used to have sex at least twice a week now only twice a month, if we are lucky 3 times MAYBE. (They are all quickies too, there’s never any foreplay😪) I’ve communicated this and he said he’s “trying”, yet no effort is made. We even tried putting it on the calendar. (Totally ruins the mood for me that we have to plan it but hey it’s better than nothing) He canceled all three times we scheduled so I gave up on that. I’ve went out and bought lingerie, doesn’t really make a difference. Any tips or advice or something I can do to entice the mood? Or honestly something I can do to make me feel sexy about myself even. My self esteem has dropped so low.