Help in deciding joining a company

Some background: I'm a frontend dev with limited backend experience and I've been on a break since the last 2 months or so. Since the last month, I have started actively applying. I have not yet applied to any of my "dream" companies and I've been mostly applying to random companies for practice (admittedly I did not receive any calls).

I'm a React dev with around 4.5y of experience and Svelte dev with around 1.5y. Based on this, a different company reached out for the Svelte role and I also cleared all the rounds.

Dilemma: I don't believe there is any scope for Svelte in the future, but the pay is good. I also have not applied to any product companies where I would like to work. So not sure what I'm missing out on.

What should I do?

Should I just join and not search? Can I join the company and start looking for other openings during my probation? Is that allowed? Just search more since I can maybe look for foreign companies as well and there are still other companies out there?

Would really appreciate your help. Thanks.