I want to get into cryptocurrency, but my account won’t allow me to purchase crypto directly or through a spot ETF.

So I have a Fidelity custodial account, and I really want to get into cryptocurrency, but my account won’t allow me to purchase crypto directly or through a spot ETF. So that leaves me with the option to after a company like Coinbase or Microstrategy. I’m concerned about microstrategy because I’m concerned about Bitcoin with their lack of quantum resistance, but I feel like they could still come back up at least one more time? And obviously if Bitcoin goes quantum resistant, then that risk is nonexistent. The advantage of Coinbase is their more diversified exposure and their exposure to USDC, which is facing rapid adoption now by platforms such as Visa. So I guess are either Coinbase or Microstrategy worth it? Is there some other company to go after or is it not worth it if I can’t purchase crypto directly?