1) First of all you need Bitcoin and Ethereum wallets. I prefer to use https://blockchain.com wallet but you can use all wallets that you like.
2) You need to have at least ~ 40$ Bitcoin (min. 0.005 BTC) at your wallet.
3) Then you need to exchange 0.005 BTC to ETH using exchanger https://btcswap.online on course 0.005 BTC - 0.246 ETH
How to exchange here:
1. Fill the form and click "Exchange"
2. You will see the BTC address of exchanger where you should send specified amount of BTC from your wallet (don't forget about commission for transaction in BTC network about 0.08$)
3. You will receive Ethereum after the 1st confirmation of BTC network, it takes about 5-10 minutes
4) Now you exchange Ethereum to Bitcoin using exchanger https://coinswitch.co on course 0.246 ETH - 0.0073 BTC
5) So you have 0.0023 BTC (more than 18$) profit per one circle of exchange!
6) Repeat this procedure 9 times and your profit will be more than $150 ! If you start with a larger amount of BTC profit will be higher.