Do the whole Back to the Future thing and take back a list of lottery winnings, stock picks, etc. Just keep slyly moving things around at the proper times and you'd have no trouble becoming the next Bezos.

Not a bottle of Vodka and Champagne, I mixed both of those to excess the last time around - never again

Half my daydreaming at work has been prepping for something like this, Honestly the most useful thing I can think of is just get a book to write down your plans along with important dates and information you need to remember.

The 2nd best thing would probably be the largest portable harddrive that could still work on PCs of the upcoming era.

Like everyone else I'd probably try get a lot of money early on, If I was transported back into my past self as a child in the 2000s my parents did let me pick lottery numbers so that's the easy route, Then I have to find a way to buy bitcoin at age 13 (which I ALMOST! DID!)

Then more personal stuff I'd a lot try harder to convince my grandparents to give up smoking as it's what took them before I hit my 20s. After that I'd probably re-waste my time playing Call of Duty and Battlefield in it's heyday, tho on a much fancier setup.

Also try to save David Bowie and Harambe in hopes it stop us entering the bad timeline again.

Future weed.

How the fuck do you take your self's place? You're either a your current age trying to identify as a baby or you're a baby which doesn't have the mental capacity to remember having the historical info.