Sounds interesting--I've never heard of it before. I do know that 4 in numerology represents structure, system, and rules. It makes sense that your general life lessons involve taking risks and branching out, based on that given number.
Did you get your karmic number by adding the single digits of your birth year + month + and date? I forgot the formula but that's supposed to give you your numerological number. I don't know if that's karmic numerology though.