Advice regarding switching.

Currently having 2 years of experience in Full Stack Development with software’s like Spring Boot, React.js, SQL, Graph QL, Docker and more. Now I just want to switch to a good firm with a good package, how much DSA should I need to grind? And should I start dropping cold emails?

Note: In my current company I have a notice period of 90 days

It will be very kind of you all to advise me about these things.