I used to earn cryptocurrency by mining. Then I tried trading on a cryptocurrency exchange.
What are the most profitable ways to earn cryptocurrency in 2021?
Mining is still profitable but not on Bitcoin anymore, trading is good but you need ample time and you should be well organized to come up with a good trading profit, right now the most profitable way to earn Cryptocurrency is bounty hunting and freelancing, there are already thousands of people and thousands more in the freelancing in the world of Cryptocurrency find your niche explore it and develop your skill.
If he can pay a low fee for the electricity, he can continue mining bitcoin or altcoin. But if it is not, that will not be a good idea.
Bounty hunting and freelancing still help people to earn crypto, especially earn ethereum or bnb. But will not be easy to research which project can increase later.