Should I resign?

Switched from a product company to a service based company ( 6 months ago) & working as a product designer (solo). Hate the work so much that it is getting impossible to spend 9 hours there. 3.5+ hr travelling time which leaves me no time and mental bandwidth to work on my portfolio. The pay is fine, but the work is not challenging enough.

I’m in my formative years and need exciting work and good projects to enhance my skills. Stuck in a vicious loop.

Is it okay to resign without another offer?