Many people say altcoins are risky. Of course, these are very volatile markets, they don't have the stability and security of Bitcoin.
In 2 months they make 300% and then in the next 2 months they lose everything by doing -300%.
However, by buying at fair prices, several months before the Bull Run, huge profits can be made.
Of course, you have to sell at the peak or just below ... you can't do holding. Except the ones you staking.

My small investment strategy involves:
1) Evaluation of the history of the altcoin (including ATH when it was reached, whether at the listing or not)
2) Circulating and total supply (comparison with the others)
3) Market capitalization
4) Spread capital across multiple altcoins, based on price. Small capital because it is known that the scam risk is always there (especially on small capitalization or newly born ones)
5) Never sell. If you buy in September and you know there is a bull market in 2021, never sell. Never. Even if the price decreases relative to your purchase price
6) What am I doing now? I'm selling slowly. Little at a time.

RISES (BULL RUN)
I will not mention BTC and ETH because I have been holding them for some time. I only carry over the altcoins I bought in the last year (2020). Mostly between August / September / October. In short, in the price reductions (buy the dip).

✅Beefy Finance (BIFI): 425X
✅Pancake (Cake): 74X
✅Bakery (Bake): 73X
✅Sponge: 62X
✅Fry World: 23X
✅Egold: 18X
✅Zilliqa: 14X
✅Aave: 13X
✅BNB: 10X
✅Bancor Network: 9X
✅Polkadot: 7X
✅Synthetix Network, Cosmos: 6X
✅Algorand, VET: 5X
✅Chainlink, REN: 4X
✅Ocean, Band: 3X

These are the main ones. Obviously these are approximate increases by averaging between entry prices and today's prices. I have clearly sold something in the past few days because the Bull Run will not last forever. I have now bought Goose Finance (EGG), PizzaSwap and Brew.

What earnings have you made? What is your crypto that has brought you the most earnings?