Web dev, possibly mobile app dev. Not the shining cutting edge, you'll struggle to compete, but the "boring" bread and butter stuff (think "utility company app for meter reading" and "replacing that brittle/broken Sharepoint/Excel based workflow with a simple Ruby on Rails CRUD app" more than "instagram" and "cloud AI internet-of-things"). Focus on adding (and articulating) real business value, not on getting to play with the latest shiny thing.
Alternatively, find a niche that needs fixing with a CRUD web app, then build and sell it.
A couple of years of doing that, always making sure you're educating yourself (educating doesn't have to equal scrambling to keep up to date with every fad or sitting in a classroom, it means making sure that you're adding skills and increasing your proficiency in ways that adds value to your work. Read a few CS textbooks, it's good to know the jargon, and understanding the theory behind what I knew to work was very helpful for me), a lot of good firms will take a good hard look at you. Just always keep in mind that you're "invisible" to recruiters, so you'll probably have to hustle a bit/network a lot.
Anyway, that was roughly my path, combined with moving to London somewhere between paragraphs one and three (employers here care much less about my missing degree than they do in Denmark). YMMV.