What kind of entry level jobs are available at startups past the seed stage? (I will not promote).

I have two years of experience post university, a little bit of everything from marketing to market research, physical product development, UX etc. but not substantial enough that I could get even a junior role in any of these areas. I’m looking for a role in an established startup anywhere between 20-200 employees. Reason being I’m a mum so I need the stability. Also because I took a long career break in order to be a mum and roles like Founder’s Associate (which I work as currently) don’t give enough “heft” to my CV. A generalist CV clearly isn’t serving me so I really want to build some discrete skills and forge a distinct career path. I don’t have the right personality for Sales and Customer Success doesn’t appeal to me much (except where it relates to feedback and product dev). So, what sort of roles would I be suitable for and what's my best path forward? Thanks in advance, also UK-based in case it's relevant. i will not promote