Don't worry, this happens every now and then and we always find a fair way for you to upgrade (generally refunding unused time on your Personal License).
For clarification, the $50k limit was for Construct 2, NOT Construct 3. For Construct 3, if you're registered as a business of any type you need a Startup or Business license. Personal licenses are for people using it not in a business capacity of any type. There are no revenue limits on Personal Licenses but generally you'd register as a business if you're starting to make good money.
Feel free to email us to clarify what you need, and we'll come up with a solution for you.