I'm liking the "going back to when I was 6 with all the knowledge I have now" option, but in reality 6 year old me would probably be too immature to know I need to remember it and by the time I needed to use that information in any sane way it would have been long forgotten.
I mean some people are saying get bitcoin early days, but 6 year old me was at least 10 years off Bitcoin existing.
It would also really suck knowing how easy it was to obtain information in the future only to be stuck in the past and barely have access to the internet at all.