People seem to have become millionaires in previous bull cycles with modest investments in BTC & ETH. If I invested in 1 BTC, is it enough to make me a millionaire by the next bull run, or are there an elite number of alt coins that could help me safely achieve what BTC & ETH once did?
The growth ratio tends to decrease as the price increases, it is easier for a coin to do a 10x if it's priced at $1 as a 10x would mean it will reach $10, but it would be difficult for the same coin to do a 10x when its priced at $10 because then it will require to reach $100. So, it was obviously easier for Bitcoin and Ethereum to gain high values when they had small prices, especially Bitcoin, which is why early investors got a lot of profit out of their investments.
Those who invest now will surely get a profit but this profit can't match the profits that early adopters and investors got, that is the reason why those who new Bitcoin in its early days but didn't invest regret their decisions now.