As far as US taxation of crypto, I agree it is important to make sure you find someone who knows it and wants to work with it.  Too many tax preparers either are ignorant or want to stay away from the complexity of reporting coin transactions.  I'd suggest making sure the advice you're getting comes from either a CPA (Certified Public Accountant) or EA (Enrolled Agent).  Ideally, they'll also have an advanced degree in Accounting or Tax, indicating they're really committed to their work and it's not just a seasonal side job.

I'd also say I think strategic, proactive tax planning is underemphasized.  A lot of tax preparers just focus on reporting transactions and not trying to plan to save money.