would this method work.
1. put some money into a crypto. e.g. ETHEREAL
2. wait for it to all go up, the rates to go up
3. withdraw all or just the gained earnings and put into Fiat account as holding
4. wait for Ethereum etc to go down again, to fall
5. reinvest and put in from Fiat account again,
6. wait for Cryptos to go back to green again.
7 repeat cycle
would you consider this as a decent way to make earnings in crypto?
Yes! This is the basic idea of trading you buy low and you sell high. Many newbie has this kind of perception that trading is an easy task. But when they already engage in actual trading they discover that buying at low price is hard to determine as well as selling at high price. It seems that you are new at trading; my advice to you is to have time to study the mechanics of trading in order to minimize the possible losses.