I have developed a simple idea for the navigation of the app that I think currently is the most user friendly option. The pictures below show my idea in a basic form. The idea behind them is that the bottom three circles are ‘pages’ that the user can swipe through to quickly access different parts of the app as soon as they open it. The darker colour circle indicates to the user which one they have selected. They would then press the grey box located about the circles to continue to that side of the app.
Here is the link to the wireframe that I created: