Other than giving up on going further in 2011, 2013, and 2014, before finally buying in 2017, not understanding sooner that credit is the money printer, that debt is not real, and you can max out biz credit cards and acquire more bitcoin.

Anyway, the initial mistakes were largely circumstantial: 1) being young -- as a youth, you are more likely to have other people paying your expenses (food, rent, college starting on upper-middle class); 2) too little lack of financial adversity. In my case it was largely due to age and not growing up in poverty; 3) aimlessness in life -- if you have no purpose in life, you will not be driven to understand the truth about your environment and what may stand in your way.

Bitcoin made sense to me 1 year after I had a modest salary with my own finances, which was also 1 year after I built something of (great) substance and had started encountering bizarre things about the fiat world.