Honestly you'll have to take a judgement call here and see what kind of people A are
I've seen a lot of people say having an offer in hand is the best way to get a raise at your workplace, but in practice, a lot of senior people get sour after you do that and it may ruin your work experience
On the other hand, I've worked in startups all my life (not very long, a couple of years) and I know first hand that things are just so chaotic here it sometimes... Sort of doesn't occur to them to give a raise
Not in a bad way, more like, they're busy with compliance, business and regulations etc so much, proper appraisals and promotions is the last thing on their mind, hence, a reminder might actually be helpful
What you can do is find the friendliest senior/supervisor and have a sort of informal chat with them. Mention something along the lines of your family expecting you to contribute more or pushing you to work in a more traditional environment or get married or something like that, and try to gauge out what are your growth prospects, then take a final call