There are pros and cons. First of all, let's assume you go back to the year you were 6 instead of becoming a 6 year old in 2024 (oof). Being an adult in a child's mind, you could basically be a demi-God. You could pick stocks, pick world series winners, and even pick winning lottery numbers if you had that type of thing written down. You would also have your emotional development that you have right now. You would be seen as a wise sage-like golden child. Downside is, if you are used to having a sex life, well, kiss that good bye for at least 12 years. Another downside is living through the period of time when you're going through puberty or have to live with an abusive relative because you're a minor and can't do shit.
I think, all said and done, I'll just take the 10 mil.
Assuming I'm back to 6 years old in 1980, there's no guarantee stocks, bitcoin, lottery, etc. would have the same outcome. Alternative timeline, so many variables. No thanks.
As a 6YO, you will have zero sex drive. You may have thoughts and memories, but no desire. You'll have to wait for hormones to kick in. We see this a lot in postmenopausal women. Zero sexual desire when the hormone factory shuts down.