What this really means is I need to drastically improve my work habits and avoid distractions. I don't have a full-fledged plan, but I'm going to ease into it. I'm starting by, for the first two weeks, working on my game a little (an hour or two) every day, even weekends. I expect then I'll start ramping the weekday time up and the weekend time down, but who knows how exactly it'll play out.
The main trick will be, I think, that when I fall off the wagon because I get sick or I go on a vacation or whatever, after it's over don't lapse back into doing nothing; I'll lapse back to this low-impact "do an hour or two every day" thing instead. Because the big losses come when I lose momentum and then just stop for a month... and this has happened many, many times over the years.
A secondary issue is that my productivity has gone way down ever since we gave up our shared office space, so I have to think hard about finding some new space if I can't get myself into the 'really do 6 hours of work every day' mode at home.