How did you achieve that? Is there any spring board profession you need to hop to and from?
I've been drown more to engines and power generation. Specifically, control systems that are able to maintain stable operation despite changing conditions.
Few pieces of software I've worked on operate as "control systems". Most have been business logic.
Lately, I've been viewing "keeping the lights on", more important that "keeping engagement up".
Maybe I'll try to get into embedded/FPGA programming. Last time I applied I got passed up due to lack of experience.
1. Get a college degree in the engineering field of interest.
2. Get a job as an engineer in that field.
3. Optionally, become a licensed Professional Engineer (PE) according to however that is done in your location.
It's not like "software engineering" where liberal arts people get to be called engineers without the matching blood, sweat, and tears.
(If all you want to do is make stuff, you could learn the requisite sciences to know how things work, teach yourself CAD to design something close enough, and then either put in the hours out at community hacker spaces or contract someone overseas to actually make whatever you came up with. But, it seems like you are considering a much more serious career shift?)