Education: BE CSE passout from top tier private
Exp: 5 yrs in India, 7 yrs in USA (same from placement)
Technology: product based, java/j2ee microservices (good exposure)

I always had good work, technology, leaders and hike. Never thought of switching career. But now during lockdown I somehow checked leetcode and got interest in algos. And got interest in joining FANG companies. I have started to learn/practice algos and sys design. Thanks to leetcode community for the organized prep info.

Question:
Is it too late to apply for FANG companies after 12 yrs ?
Should I focus more on algo or system design for 12 yrs exp ?
How to get prepared for interviews ? No interview exp after placement.