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If you're in the US, get your credit frozen at the three well known bureaux and ChexSystems. Contact your brokerage and ask about what extra protections are available to protect your account. If available, be aware that they're usually onerous and a pain to recover from if you lose the credentials. See if you can setup extra protection for your cell phone account, too.

The nice thing about the traditional financial system is that when things go wrong, there's usually a way to make things right, even if it takes time (which you seem to have). Read your statements (I like paper statements because they arrive and remind me to read them; others don't because they could be intercepted).

If you are setting up a company, then you would tend to give your clients the company tax id, and not your own, which might help ease concerns about identity theft?