Earlier quoted context omitted.
https://en.wikipedia.org/wiki/Kelly_criterion https://en.wikipedia.org/wiki/Post-modern_portfolio_theory
I recently downloaded about 10 years of monthly price returns for QQQ, TQQQ, NVDA, GBTC, and a few others. Then I asked ChatGPT and Gemini (separately) to find the portfolio that maximizes an adjusted CAGR — roughly, mean return minus ½ × standard deviation². Result: 70% NVDA, 30% GBTC (Bitcoin), and 0% QQQ or TQQQ. Honestly, not a bad mix — especially for a small, high-risk slice of your portfolio. Next, I compared…
Thinking about it, my recommendation is read:
https://www.reddit.com/r/personalfinance/wiki/index/
and then after maxing your 401k, open a Betterment account, and then max your HSA if applicable. The tax savings easily best custom portfolio picking.