I have a couple ideas for you from my own experience.
There's about a bajillion C/D+ stage 100-500 person software companies in any B2B vertical you could mention who would fight hard for your type of experience. Not necessarily SaaS click-and-drool tools for corporate drones, but unique and opinionated products that have some significant engineering innovation inside. Those companies have essentially no ability to attract talent organically, anyone interested in FANG would turn up their noses, and their number one problem is quality people. In many cases the CEO/CTO leadership is incredibly strong and smart; the colleagues are happy, motivated, intelligent, and disciplined; and the work/life balance is good for the middle aged. They're vital to their customers but under continuous competitive pressure so it is far from a snoozy place to serve out time - it's a mission and a struggle every day, things change often, the pace is fast. It can be very rewarding and compensation is decent. The tradeoff is the big exit is vanishingly unlikely.
Second idea is go into consulting/professional services. Not Accenture or anything horrible like that, but dozens of boutique/smaller firms with decently inspiring leadership and a very high standard of colleague. Work is variable in interest and environment, pressures are somewhat unfairly around whether you are billable or not which is not really in your control as an engineer.
Free reminder that the USGS is involved in an epic, nearly decade-long collection of mid- and high- density lidar of the entire continental USA, and the QC'd data (point cloud & derived) is published gratis for everyone to use:
There's about a bajillion C/D+ stage 100-500 person software companies in any B2B vertical you could mention who would fight hard for your type of experience. Not necessarily SaaS click-and-drool tools for corporate drones, but unique and opinionated products that have some significant engineering innovation inside. Those companies have essentially no ability to attract talent organically, anyone interested in FANG would turn up their noses, and their number one problem is quality people. In many cases the CEO/CTO leadership is incredibly strong and smart; the colleagues are happy, motivated, intelligent, and disciplined; and the work/life balance is good for the middle aged. They're vital to their customers but under continuous competitive pressure so it is far from a snoozy place to serve out time - it's a mission and a struggle every day, things change often, the pace is fast. It can be very rewarding and compensation is decent. The tradeoff is the big exit is vanishingly unlikely.
Second idea is go into consulting/professional services. Not Accenture or anything horrible like that, but dozens of boutique/smaller firms with decently inspiring leadership and a very high standard of colleague. Work is variable in interest and environment, pressures are somewhat unfairly around whether you are billable or not which is not really in your control as an engineer.