I transferred from Robinhood to Fidelity years ago and never looked back. Mobile app and website work great, had to call customer service twice and they were always helpful, good ETF screener tool. They have local branches in most major metro areas for in-person customer support as well. Commission-free trades just like Robinhood. Seamless integration with most tax software.

I just pile leftover savings into Small-Cap Value funds though, so my needs are rather minimal.