First, it is important to remember that new businesses are rarely successful right out of the gate. If you are new to the idea of running a business, it becomes even tougher to get this right. My advice would be to look into some business mentoring services.
You have some great options out there, like Carrley (https://carrleybusiness.co.uk/business-mentoring). They provide a lot of useful insight into how to make your business more successful and can help you to get through those tough few months. Having a business mentor can make sure you can build a better business from day one and encourage clients to stick around.
These services can be quite useful for building a better foundation, meaning your business is more likely to succeed. Good luck!