Is it possible to bring back the spark in relationship?

We’ve been together for 3,5 years (living together for almost 3yrs). I’m 23, he is 25.
in the past year I feel like we’re stuck. Sometimes I find myself thinking that maybe it’s all over because we’re more like roommates than couple. I respect him, I care about him and etc but I do not feel desire or anything sexual to him. I think that he started to notice it and he’s trying to get touchy with me, engage in sexual stuff. But I just don’t feel it. Sex feels like an obligation. I really do adore him and he is a great man, pretty much like everything the girl can want. But the spark is just gone. How to bring it back?

I’ve tried going on dates with him like we did in beginning. But things been tight since covid, and we we have some financial issues (we’re not in debt but we had better times). We do not have money for fancy stuff, so no vacation or get away is possible right now. We can’t just run from routine.

All answers are appreciated!
Is it possible to bring back the spark in relationship?
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