Auto insurance

I’m sure someone has asked this question before but I need help. I received a letter from GEICO saying they will no longer be able to insured me since I am using my car for deliveries and they do not allow that even though I only do this as a side hustle and we are covered by Amazon commercial insurance while delivering. I spoke to their representative and they said in order to reinstate me I need to send a letter from Amazon showing that my account have being deactivated but who the hell want to do that. I have done this gig for a year n half and it’s being very helpful to me. So my question is there any companies that I can insured with? Any suggestions without this foolishness because there is no way I’m deactivating to keep my insurance and mind you I have insured with GEICO for 17years!! Please help. Thanks in advance.