Earlier quoted context omitted.
You’re assuming OP wants to invest all of his money in Lithuum. And that past performance remains the same
He's also assuming that ETF is going to perform the same way in the future, when the whole point of TFA is that lithium demand is about to surge.
But sure, buy this and hope it "surges" more than the general market. Given that billions of devices already have lithium cells in them and the historical performance of the Lithium ETF is still quite disappointing compared to the broader market, I wouldn't hold my breath that this time is any different.