I've heard pretty much all the other good recommendations that others have added, but this one - "Sell to businesses outside your time zone before and after work" - is novel! This is a great idea, though I can imagine there might be some challenges, such as if support issues peak/surge, there will be a few sleepless nights...but that might happen even if dealing with clients in same time zone. Regardless, this is quite a novel idea; and i think a good one! Kudos!

It's so interesting that this comes across as novel, though I totally understand how that can be - it's an unavoidable reality for those of us building side projects while living on the other side of the pond :)

It also plays into the R&D stage where the dynamic of participating in forum posts and irc/slack chats is a whole other experience. There's a forum or two where I tend to post a question at night, and don't even look at it till the next morning because I know nobody's going to really get to it till then (my time, in Israel).

The hard part with this setup is getting motivated after a full day of work, family, etc. Pushing before/after work is perfect in terms of time, but not in terms of energy. Burnout/fatigue becomes a tougher challenge. That's really a whole other subject though...