[geuis]

Two things I would recommend:

1) Charge more. Lots of other people have said that too. If you have to turn away customers, then you know you can raise your rates. You need to do a/b testing on this (i.e. high-low) until you find the proper rate at which the number of customers is balanced by the price you charge.

2) You need to automate some stuff. If I were you, I would invest a little time into writing a simple tool where you can enter the corpus of text and translate it via Google Translate. If you set up your tool to allow multiple inputs, you can easily start a project by filling in all the text to be translated and hit "Go". Afterwords, you just go through each translated entry and correct things. This should be significantly easier than doing every single thing by hand, over and over.