Initiating, having a well defined plan, possessing full control, having executable qualities, monitoring and then closing an investment laid down plan is on tricky methodology to find a good walk around in the crypto market.
It's easier to succeed with Bitcoin as investment because it is a very old and tested projects throughout last 15 years in cryptocurrency industry and market. History of cryptocurrency market shows that if you invest money in bitcoin, hold it, you will not get loss or at least won't lose most of your capital.
If you can hold your bitcoin, you can get rich with it.
See HODL camp to see voice of history.
https://hodl.camp/Bitcoin profitable days chart can give you strength of holding too.
https://www.bitcoinmagazinepro.com/charts/bitcoin-profitable-days/With altcoins, they are newer projects, even newborn in this market cycle, and no guarantee that if you can hold altcoins, you can get rich with them. Risk of losing money to altcoins is high, again see history.
Dead coins: Over 50% of cryptocurrencies have failed.