WordPress runs a huge share of the web and is usually not the problem. What people call outgrowing it is more often a plugin stack nobody understands, or a site being asked to be an application.
This tells you which, in about two minutes. You do not need to be technical to answer any of it, and there is nothing here you have to buy.
Your result appears on screen. No email address required to see it.
This is a starting point for a conversation, not an audit. The questions are weighted by how expensive each thing is to unpick later, and the heaviest weights sit on the limits that do not improve on their own. Most people who take this are told to stay where they are, which is the honest distribution rather than a modest one.
Most of what it recommends costs nothing and does not involve changing developer. If your answers show the project is fine, it says so.