Every time our situation has changed, my husband and I have renegotiated the chore distribution. What used to happen is one of us would feel like the distribution was not fair, get frustrated, and then we would talk about it and come up with something that we both liked. It's gone back and forth. I wash the dishes now because my husband has a skin sensitivity to hot water, but after he retired (I'm still working because I enjoy my job) he was doing all of the dishes since it gave us more time in the evenings together. When we both worked. it was 50/50, when he retired it was probably more 70-80/30-20, and right now while I'm on mat leave, it's back to more 50/50.
We had to talk about it, and we had the benefit of both coming into the conversation feeling like we had to share the duties because we both benefit from a clean home. (Except for dusting. I hate dusting. So does he. Our furniture is just slightly dusty until we have visitors, and then I'll give it a half-hearted wipe).
One of the most important things we did was make sure no one does the tasks they hate the most. By coming to the agreement together, it also means that neither of us has to remind the other one. When we were younger and still figuring this out, we would nag each other, and it was the worst. I'm not his parent and he isn't mine. Our happiness increased immensely once we figured out how to organize things so that we wouldn't have to do that.
I would suggest taking the direct approach. Does your husband notice the state of the house? What does he think about it? What is his expectation for the household? Once you know the answers to these question - and not by guessing, by hearing it from him - it will help you determine if you actually need advice, or if he just hadn't realized the state change means that other responsibilities change.
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A comment about spending so much time together - we noticed something similar when my husband stopped working. He was excited for me to come home and do things, whereas although I love my job, it's still a lot and I needed to unwind. Directness served us very well here too. We have a shared calendar, so if I made plans with friends on the weekend, I would put them on there so that he could see them. We usually spend a couple minutes right before bed going over our plans and intentions for the next day. Sometimes these are things we're going to do together, and sometimes they aren't.
I would also tell him things like "I have this creative project I want to do, so even though I'm on the couch, I need some alone time for an hour", and then by setting the right expectations, he wasn't constantly bugging me to play games together, but he also knew when I anticipated being done.
Being pretty open about plans like this has helped us know what to expect. It's kind of like what I tell my team at work. I don't care if something's going to be delayed. It's unfortunate, but stuff happens. Don't surprise me with it, though. Be direct, tell me what's going on, and we can get through it together. When I started applying the same behaviours to my personal life, a lot of things got easier too.