My questions is not on the technical side, since obviously you can create an address in a very much anonymous way. However, when it comes to spending it or convert it into fiat or even when spending it on a legit shop online you have to leave an identity trace.
I know that with small transactions is fine, under the radar basically, but what happens with significant ammounts?
I am asking this because I intend to become rich in 4 or 5 weeks

Base on my knowledge bitcoin is half anonymous and a half, not anonymous. How I can say it because of the address is like a Quick Response Code "QR Code" if you scan the QR code it will appear the cost or meaning inside the QR code. You dont know who person but if you already study or trace it, you will know whose person use that address. But the problem only a few people have the skill or knowledge scanning the crypto address.