Speaking as a wife...
I'll text 143 sometimes when he's at work...we both work shifts so are like ships that pass in the night often.
Old fashioned, but have his tea made when he comes home...make him his favourites even if they aren't mine...
hold his hand when we're sitting together on the sofa. Watch football/rugby with him despite not being into it myself. Do little things for him...like, erm, oh gosh I can't think now...he says stuff like "I'm so lucky to have you" but I now can't think why!
Sit and chat to him whenhe's in the bath...snuggle up to him in bed whether it's for nookie or not...arrange stuff to make his life easier...get cash out of his bank for him if he needs to take it into work for the lottery etc, I save all my 20p's in a jar for kids tuck shop/odd bits of shopping/get him a takeaway now and then (I don't particularly like them, he loves them).
It isn't all one-sided...what does HE do for you that makes you feel loved? Maybe do stuff like that in return?
I'm a firm believer that life as a couple doesn't get put on hold once children come along...get the kids to bed early, make a nice dinner, have a glass of wine...watch a film, have an early night.