The key method of developing your business is advertising. Call it integrated marketing with all the other forms of getting your message out, but it still boils down to advertising, which is making it public and memorable.
You may advertise in a trade magazine or on a billboard, but your website is the only form of advertising that's constantly available to your audience. Your domain name is the focal point for all of these marketing components, at the corner stone, and the foundation from where you build your brand upon.
Get a dot com name. Other extensions may gain popularity in 20 years, but for the foreseeable future your marketing efforts will end up in the junk folder. Even in tech where .io and .ai have some traction with start ups, it translates into they're in beta, not ready for primetime. As a decision maker can you back your choice of doing business with an organization that's not really established?
Read my last post about Branding for Authority and Affinity for more information. Here are some premium domain names that I have for sale.