Even in a one-person company you don't have to do everything alone. You can offload certain things to other people. For example, you can get an accountant to do

Even in a one-person company you don't have to do everything alone. You can offload certain things to other people. For example, you can get an accountant to do the finance stuff for you. There might also be tools that you can buy or rent that take away some of the load. There are lots of tools for building websites and payment solutions for example. I am sure there are planning tools as well. And once you have outsourced as much as you can, if you still cannot manage the load, that might be a signal that you need to really grow your company and to hire people, although there is also the possibility to subcontract part of your work if you do not want to commit to that.