tbh, coins that will make you a millionnaire are not even created yet.
I'm only allocated in ETH atm and plan to flow more stablecoins in it during this summer if we get lower.
But during the last bull run what make most of my portofolio gains (mid 6 figs) were news coins like $JEWEL, $BTRFLY $DPX etc.
All this coins are from the defi 3.0 era with $OHM & $TIME. This are the coins that mooned way too much on huge liquidity. And they are the coins that made you a millionnaire.
But this only applies if you are investing 5-digit amounts. That's why, those who have a smaller portofolio, I advise you to farm airdrops, to sybil them. At the moment Zksync is good but also many others. Just a month ago I got 8000 $ARB of airdrop (which I dumped for $13k). Btw, I'm actively farming airdrops myself, by automating it and delegating to VA's.
In my opinion it's the best way to create a solid portfolio and then invest in the new tokens of the next bull.