Can you change your Zoom Phone Account Type from Business to Personal?

Would appreciate any answers to the above as I'm in a similar situation. Would like to switch from a business account to a personal..?

I'm sure you could change your account type by contacting sales while below are some info related to your 10DLC concerns. 

I don't send SMS campaigns; I just send a text occasionally to a client. Does this apply to me?

The major wireless carriers have adopted new rules for sending text messages to their customers in the US and Canada. These rule changes mean that all messaging traffic sent from a Zoom Phone customer to a mobile number must be registered with the business that sent it. As used here, the term “campaign” can be confusing. Most people are familiar with a campaign as a marketing term but in this context, it covers all text messages sent from a Zoom Phone account to wireless customers. You create a campaign to identify what type of messages you are planning to send to wireless customers so that the mobile carriers know who is sending the message and what it should be about.

Here is the reference link: 
https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0059576