It'll be immensely easier to get a proper investor if you can generate enough sales to break even (i.e. to pay for your costs), because that's an important step to demonstrating viability and avoiding the "too early" argument.
So, given what you already know, how many customers do you need to generate enough revenue to pay for costs, i.e. what slice of the market should you address? Define that segment of the market, e.g. "kindergarten teachers in London" and devise the tactics to get them on your "Buy now" screen, and then to get them to click the "Pay now" button.
Sales strategy really depends on what space your business is in (especially B2B or B2C), but a basic first step could be something like "I'll create a Google Ads campaign for that target, measure how they respond to the landing page and integrate Intercom so I can discover/answer their questions when they reach the website". You'll learn new things about what customers think of your service - pricing, features, etc - that will help you define the next step.
If you haven't received a payment, I'd focus on converting those 14 prospects into paying customers and learning why they have or haven't purchased. Then, if you're a B2C business, focus on increasing that number x10, i.e. get to 100 paying customers, then 1000, until you break even. This is when an investor, in my mind, will be useful: to accelerate growth, and for that you need some sort of growth beforehand (which will also be your main argument when negotiating an investment).
When you are at this point, your premise will be "I'll use this money to hire a senior sales executive specializing in X to devise a proper sales strategy, and/or a senior marketing person to devise and run marketing campaigns").