Many startup founding engineers share a common experience, so remember that you're not alone. Avoid feeling desperate for change. Instead, set a specific timeline to learn the technology you want to specialize in and work towards achieving that goal before considering a switch.
Consider yourself fortunate that you're still working with the tech. My experience is I was pushed to "manage a team" of 2 people 🤣 and then bashed on bad code that founder himself approved days back. So, never ever become manager, lead or anything without any experience, it's just a trap to squeeze you
Founding engineers with just 1-2 years of experience, are pushed into managerial roles without a clear rationale. They face criticism when their teams don't perform well. Even when they acquire management skills, they are often not given the chance to actually lead because the founder is reluctant to relinquish control over the team.
This is the reality of Indian Startups.