Help I gained 1200 users and want valuable feedback

Hey all,

So I have an investing app that gained 1200+ users in the span of the last few weeks due to some TikTok videos. As the creator of the app, I love it and think it is really useful; however, I have been receiving mixed feedback.

About 65% of new reviews are 5-stars while the rest are 2-stars or 1-star. I want this app to actually be useful for people. What is the best way to get feedback from users? I would also love feedback from any of you with and iPhone and like to invest.