I think the fastest way to earn BTC is deposit at least 0.01 btc in your wallet and use it at Trading Sites. Because nowadays, BTC is so important right now. You need to earn more because the halving event is now on process. So, If I were you, I would now keep my BTC in my wallets. If you dont have any money to deposit it on your wallet. Maybe the other option is to play at gambling sites. Some gambling sites are offering free BTC when you have zero balance. So if you are lucky enough you can earn upto 0.5BTC in no time.