For me, it is feeling understood and loved for who I am that does it. It's like when you get into comfy clothes at the end of the day. At home, I want to be able to do that emotionally too and still feel loved, warts and all. And of course, I'll gladly reciprocate. This includes being able to flip my silly switch, acting goofy and going on a crazy idea- association bender without being told to behave, or being 'managed'/talked down to (how I experience being managed) in a patronising way.
Aside from that, for daily maintenance, I need you to check in with me. I live with an extreme introvert and I do understand him needing to decompress when he comes home - I don't mind at all. But sometime during the night, I'd like to 'connect' for just a bit. It's as simple as just focusing on your partner. It can be done by for instance talking about your day and listening to each other, or just watching a movie together while being held closely. It can be as simple as squeezing your partner's shoulder while they're cooking, for that matter.
It may also be useful to check out what his love languages are. Mine are Touch and Words of Affirmation. Those are the things that make me feel loved the most, though I still appreciate the others very much (Quality Time, Acts of Service, Gifts). It helps if you share one - it becomes easier to express and maintain your love for each other that way.