Maybe do the Gerogia Tech Online Master's in Computer Science? If you're considering studying full time the fees ($10,000) are trivial compared to the foregone earnings. You don't even need to finish before you start interviewing.
Or you could "just" learn in public and chronicle it. Make a Twitch channel or livestream on YouTube. Do enough that people you don't know personally will vouch for you for a FAANG interview. Do three months of Leetcode and go to a few meetups and someone will do that.
It should be pointed out that joining Georgia Tech's OMSCS is not trivial. It's a limited-enrollment, fully accredited master's degree program. You need strong test results and convincing letters of recommendation from former faculty or mentors to be admitted.
OP has an Engineering degree. He is not going to have much trouble getting admitted. GA Tech has been quite clear that the goal is to admit everyone they think can pass who has a Bachelor's degree. They're not even aiming to make a profit, just cover costs. They're kings.
https://omscs.gatech.edu/
Alternately go to the Recurse Center. They exist for people like you and make their money by helping you get a job afterwards.
https://www.recurse.com/
Or you could "just" learn in public and chronicle it. Make a Twitch channel or livestream on YouTube. Do enough that people you don't know personally will vouch for you for a FAANG interview. Do three months of Leetcode and go to a few meetups and someone will do that.