I would agree with Sarah, leave out the word “really”, and I would also change “realise” to the past tense “realised”, as it is an event that has already happened. :)

It is fine assuming you already explained the experience, but "really realize" sounds awkward. I would suggest just leaving out the word "really."

It's grammatically correct, however it sounds a bit awkward to a slight extent, i would personally say: "soon after that experience, I've realized that business in the music industry, is what i should strive for."