When a project is coming in market with some real use case which will benefit uses the the early entry gives huge profit. Bit we need to recognise the potential in early stage. Altcoins are profitable but not as secure as bitcoin as they are controlled by team. I don't keep altcoins for years except the coin has extreme potential.
Simple thing to me, Make money from alts by trading in short term and convert it into btc and hold for long term.