Hello,
I found an interesting article on Cointelegraph.
https://cointelegraph.com/news/want-to-be-a-millionaire-two-main-rules-of-bitcoin-investingIt might sound very simple but there are two things needed in order to become a bitcoin millionaire:
1) Holding your coins (DO NOT SELL THEM FOR FIAT)
2) Store them secure away from thiefs and hackers.
Potentially bitcoin can rise 100 times in the coming 12 months and there are some selloffs - it is important that You are not a part of those selloffs, and hold yourself from not selling too early because bitcoin will be more expensive later.
In case you want diversification, consider Monero. You can spend Moneros pretty much anywhere bitcoin is accepted online via xmr.to - this makes your purchases anonymous.