How can I help my man with sex drive?

So we used to be like rabbits, every night just all over each other. Well it's been about 3 months now where he has had no sex drive and has only had sex with me because I've asked for it or I've initiated it and he didnt want to be mean and say no. He says he hasn't even been able to get a real erection any time we've had sex recently.

We did talk about it a little bit, he assured me it's nothing to do with me and he feels bad about it because he loves having sex with me and he misses it as much as I do. We think it may have something to do with stress or working too hard.

But what I want is some advice on how I can maybe help him get in the mood? I am 34 weeks pregnant so I know I dont look super attractive but I do try my best. I try to give him massages and snuggle him and give him goosebumps by rubbing his body and stuff, but I just think hes too used to all my attempts and I need a new way to turn him on.

Please if you have any tips help