My path was to join a mobile game company and work server side. There is plenty of need for vanilla REST APIs, content management systems, build pipelines, devops, admin panel development, billing systems, and other code required to run the game. I've also seen demand for technical artists who write plug-ins for Unity and other tools that help 3d artists. Whatever path you use to get in, it's pretty easy from there to move around to other areas and companies.