Stuck with not-so-fancy tech stack

Hello, everyone.

I am a software engineer with 2+ years of experience in C# .NET Core working in a B2B Saas and I feel market for mentioned tech stack is comparatively limited and although I have good dsa knowledge and dev skills I get limited job opportunities. So, what could be the best option for me right now? Continue grinding leetcode and interview for language egoistic companies like MAANG or learn a popular tech stack which most companies hire for?

Lastly, to append to my previous question, from now onwards dsa grinding will have good ROI?

Looking for genuine guidance from experienced folks, would like to hear both sides to make a informed decision.