Scalability is very important. You can’t do everything by yourself as you only have 24 hours in a day. Can you leverage or outsource your tasks?
In any business model, you must be able to find a business model that scales upwards. In other words, it means that the business will earn you more money the longer you are in that industry.
If the business or the market that you are in requires you to work longer and longer for the same amount of pay, then you either need to innovate a new idea or get out of it as soon as possible.