This is the motto. Never take excessive risk for this virtual assets. Split your money into smaller fraction by having couple of different coins. This is the best to protect your money and yourself.
Agreed. Following your heart will turn out being one of the most stupid decisions when it comes to investing. That's exactly how most people lose all their money.
Be a bit more logic, diversify, mitigate risk. Don't forget all you gave up to save that money.
Pragmatically speaking, cryptocurrency is still a fragile market and no one should invest 100% of his capital on it. If one really believes in the technology, I would say 50% is already a too aggressive slice but might fit.
Finally, diversify your portfolio as already said, but do it properly. Three coins is far from enough, consider buying at least the top 10. You can weight them based on their market cap, so your portfolio follows the market average movements.