I’ve barely written code in over a year, and haven’t done any significant greenfield work my whole career. The work I have done has been mostly in legacy or obsolete technologies, and by that I mean mostly old version of stuff that’s still out there.

There are heaps of legacy code out there needing to be maintained, and it seems like all the cool kids just want to do green field dev because fixing somebody else's insane code isn't "fun". You're likely more qualified than you think, you just need to market your strengths.