I think if I have time and some capital, I will test all four ways to rotate the income stream. But I think making money from the electronic money market is of course the price of coin will affect a lot of profit. I witnessed my friend went bankrupt when he made a miner. The market for campaign reduction is also ineffective. Only trading can make money in the bear market but not everyone can do it. If the market is stable and developed, all four ways will bring us a lot of profits.