If I have infinite money and no one else does I wont crash the market immediately because one person doesnt buy enough to affect anything quickly.
The only thing It means is Ill be richer than Bill gates without having to work. I might not even need to pay taxes since I dont really have an income. I just have infinite money.
Ill probably get myself a house, decently large size but probably not mansion sized, and hook it up to as many self sustaining utilities as possible so I wont have to worry as much about the flow of extra money via me paying bills. Id have a well so I dont need to pay for water, power generators (Probably solar or wind) to cover electricity, and so on. Id paint it however I want, I think dark grays and purples look cool.
Id buy some furniture for it, probably gothic styled and probably dark colors. Bone decorations, plush rugs, the works. Id set up my altar space to look cool too, with only the best accessories I can find within my tastes. (Probably no solid gold statues, for example, but maybe some simple gold jewelry to decorate with.)
Id then have an amazing time in my amazing house with no work needing to be done. I might do something like making YouTube videos to eat up all this free time Ive got so that I dont get bored. Id also feed my shopping addiction by buying stuff at a mall or online, Id have all the fandom merch my heart desires! Oh, and maybe Id rescue dogs or cats or both.