My business relies on bitcoin, where can I buy large amounts now with the restrictions in the US?

After Bittrex shut down, it's become increasingly difficult to buy large amounts of bitcoin for investing here in the US. I still have Coinbase but they tend to freeze my account for 24 hours if I do anything. Kraken declines every purchase, Paybis does the same. Skrill will only allow me to buy via card, not bank and I can't send the btc out if I purchase via card. PayPal is an option but it's a personal account, not business, and their limits are small

What are my options?