I hear that with BTC arbitrage, people make 20-25% per year.
What is the best way to do that?
You can hold your bitcoins and get profit. The ROI, after several years, will surely be good enough for you and actually bigger than 20 or 25% as you want to gain.
The challenge for you to succeed and gain that 20% or 25% ROI in average is time of your holding. It must be some years, not one or two years.
See the HODL camp
https://hodl.camp/Arbitraging is a type of trading and it is more risky than holding. I have an extra warning for you, arbitraging BTC is risky already but if you choose to swap BTC to Wrapped BTC tokens, risk will be bigger. Those tokens are not actual BTC, that is why you will increase risk by swapping your BTC coin to Wrapped BTC tokens.
It will give you more convenience to move cross chains, swaps but risk is much bigger.