Hello @Ltaapkenmanhatt,
How are you? When writing an opinion piece, it should contain your ideas on the topic and WHY you believe in those ideas. Also bring up evidence to why, and if trying to persuade a person to agree with your opinion fight them with evidence, also you may want to bring a counter argument to show people that you agree with some of their ideas too.
I hope that this helps, and if you need something contact me! :)
Thank you,
Darian D.