To my surprise, the little I learnt, I decided to start with 2,000NGN as that was all I had.
This not true as 2000 NGN i just $3.4 with the selling rate at Binance #584 and believe many exchangers has set limitation of trading, mostly Binance is $10+ so i don't know how one can trade with 3.4 and become that rich or successful. I can easily be convinced by buying and hold maybe you started with just NGN 2000 as the case maybe, you kept on topping the BTC in your wallet before the price break out. yeah, this is a genuine reason.
I don't normally use Binance for trading since it is centralized and I don't have the private key to the wallet, I rather go on decentralized exchange for my trading so I am careless of the minimum trading amount.
But there is a big chance of the story being fake and just made to get attention since $3 is too low to be traded in most exchange and binance as a centralized exchange with fees and taxes $3.4 is probably not possible to trade with.
Actually Binance doesn't need a private key to be traded with is a Centralized exchange were you transfer your coin and token into . OP already Said the fact in the previous statement which is too sad to be true.