I started preparing for interviews after a long gap of 7 years.
I am confused on the path i should take

1. should I go about solving as many leetcode problems as possible?
2. Should I improve the domain knowledge and focus on some courses there. Last 1.5 years i worked on BigData project but mostly on the microservices side of it. Should I focus on improving my spark/hadoop knowledge?
3. Should I prepare language specific things java, spring framework etc.?

I attended a couple of interviews (from small companies) and they seem to focus mostly on BigData, java, spring etc.
Are FAANG the only ones interested in DS and algos?
Should I prepare for the bigger pool or just FAANG?