What are the Democrats proposing to fix the problems with ACA?

Everyone wants to know what the Republicans would replace Obamacare with, but I want to know what Democrats are saying who agree it needs to be tweaked and improved upon. I know a lot of us Democrats want straight socialized healthcare, but I’m just talking about improving on ACA as it is now, which has been suggested by many.

I’m going through getting insurance right now, and it has been stressful. My husband has said more than once let’s just not pay for insurance at all, except the penalty of course.