To get the juices flowing don't focus on "all the roadblocks" just focus on putting in Time - 20mins to 1 hour a day - same timeslot everyday (early mornings work for me). Doesn't matter on which issue. Its about building momentum up slowly. The longer you sustain it, the more likely you will get sucked back in. I usually need atleast a month of that, to get back into older projects.

And try to work on that documentation. Good docs brings in those collaborators. Even if they have no experience, any help is better than none and those interactions will be an extra source of motivation.