Be wary of trying to recreate the success using a similar but different model.  Many people fall into that trap and fail.<p>For example, if you carefully built apps and they seem to be selling well hiring a bunch of people to build more apps may not work.  The apps may not be of the same quality, you may not be able to communicate your vision adequately to them, and maybe just timing is incorrect now.<p>Personally I would continue doing everything you are now and completely ignore the money side of things.  Pay your taxes and pretend that money doesn't exist.  Keep progressing forward and see if you can continue increasing revenue.<p>Use some money to cut corners if you can, but throwing a bunch of money at a problem doesn't tend to have a good success rate.<p>edit: Also by looking at your uploaded image - it looks like you half your income this year is from the last month.  Try to keep pushing growth forward, whatever you have been doing is working well.