Skill to add to double current CTC

Hey Folks,

Currently, having 8.5 years of experience working as FSE with Java 17 , angular, react as my current major techstack .

Current CTC : 27 LPA

I am no leetcoder , no DSA guy as of now.

What exactly to learn to double my salary as quickly as possible as I will really need some decent money in coming years as I need to take care of multiple family responsibilities .

Currently, not getting enough calls even though I have kept 30 days of notice period. The calls which come are not even ready to pay 33-34 LPA.

Requesting folks to share your thoughts and advice.