Ladies I need advice

my fiance and I haven't had sex in like a month....and he never seems to be in the mood anymore...i feel like its my fault or like hes not attrachted to me in that way anymore....i want to do something special but I babysit all day and he works all day...so by the time he gets home both of us are tired and he only gets 1 day off every 2 weeks...sooo....i never thought I'd say it but I need advice on how to get my sex life back...