Should I Quit my job?

I work in a few months old as a software developer. In a startup . Being Only employee. The CTO left some days back. Pay is decent . Around three year of exp. However I don’t feel like learning anything having no senior in tech background. Also working there isn’t motivating at all. Since the founder are basically getting a tech product made and then keeping on adding features, rather than selling already what’s been made. Make me work all days including Saturdays.

I am preparing dsa for whatever 1-2 hrs i get but I dont like doing my job. Since market is bad and ive been out of touch with DSA, I am not able to decide whether to quit and prepare for a job full fledged or keep whatever’s going going. These people have also said they will try this project for max 6 months if nothing works.