The online world can be daunting at times particularly when you're just cutting your teeth in the space. You've clearly outlined your target market and the potential pain points that you're trying to solve with your product or service for them. It does appear that you're not just keen to target museums and zoos in general but your target market is specifically the USA. However, your current geographical location only permits you to sell via phone for the moment.
You would first start by performing online market research in your niche industry -museums and zoos - in your target market- USA- to see how many rough estimate listings or outlets are returned in the search results. Now USA is a very big market so you might want to filter by region or size. You can employ either organic search i.e., directly on Google search (right now there's even a better search tool - Generative AI (ChatGPT or Bard AI) ) or make use of specific niche market search engine tools ranging from free to premium tools like ZoomInfo, LinkedIn SalesNavigator, Crunchbase, Skrapp.io, GetProspect, Hiunter.io, Uplead, Salestools.io, among others, to search for and obtain contact addresses of potential listings in your market of choice.
From there you can come up with a database of prospective organizations to approach and then carefully craft your sales discovery call pitches to introduce yourself and the brand or product/service you represent, why you think there's a fit between your product and the client organization.
If you structure your discovery call properly, you'll have the opportunity to listen beforehand to what their pain points are when they tell you what they do, how they do it, and what their goals and objectives are, and then tailor your solution to those. Ideally, you do not want to do everything on the discovery call except introduce yourself/the company you represent and how after listening to your client's story in their brief introduction you think there's a good chance to schedule a follow-on call to talk in more detail about how you can be of help. Once you have that discovery call out of the way depending on how it goes you can plan for follow-up calls, emails, etc. Having said that, some discovery calls might end up being full-blown sales pitches if circumstances allow, e.g., the client is excited to meet you and has given you the green light to introduce your product, has a bunch of questions for you, and is ready to kickstart the onboarding process.
This first scenario depicts an optimistic prospect that immediately converts by giving you adequate time and therefore you have no reason to postpone until another time since time is money. On the other hand, if you meet a lead, have a brief introduction discovery call and they have to jump into a different call or are not the right person with authority to make a buying decision then and there, it would make perfect sense to schedule a follow-up meeting when both parties are available where you can then pitch your sale.