Do you need to build your own “platform” or app? These days there are plenty of tools that will do a percentage of what you need, add some manual effort, and you have a means of transacting business. This is a good way for you to start operating, and learning what your customers need and want (did I say that these things are different?). Tesla (and a lot of successful companies target customers wants, and even aim to cultivate those wants further (for their own good, of course)
I would recommend that any startup delay the building of a platform until they have exhausted the capabilities of these low-code systems, and it begins to hurt.