OP, your resignation is palpable and as you don't think he is a bad man it would make life harder probably to separate and serve no purpose at this time.
All you can do is help yourself practically.
Think about simply things that will make life easier for you.
A cleaner if possible.
A babysitter when possible.
Sadly the loneliness tends to morph into detaching from your husband.
He is not a bad man, but he's not a good one either.
At his core he is selfish and loves himself and the easy life far more than you or your child.
This reality slowly sinks in and the love you had for him may well seep away.
I have a few friends that are 30 years married and this is the case.
They are not unhappy at all, they adapted through necessity.
They reared their children, mostly on their own, and got on with their life and careers and juggled it all mainly successfully.
But what they feel at nearly 60 is a mixture of calm indifference and tolerance.
Covid was interesting in what it thew up.
After one of my friends got Covid her husband did the minimum ish for her, whilst not being a total prat.
Her friends dropped over single portions to tempt her to eat, which he wasn't impressed with🙄.
A couple of months later he got it and she gave him a similar level of care and got on with her busy medical job.
His recovery was much slower and he definitely has had a mild long Covid.
She mentioned that she will never be his carer as she realises that she doesn't feel the relationship and his contribution over the years, warrants it.
He initially became a bit clingy whilst ill, as to why she wasn't taking time off to mind him, but a frank conversation gave him the lay of the land.
The one upside was he was a junk food eater and the reality of being unwell and a wife who has made it clear she will not mop his brow, has focused his mind a lot.
My advice if you intend to remain married to a man like that, is make and keep your friends close to you.
They will be your greatest comfort.