I want to cancel my conditional green card and transfer myself to OPT or H1-B

This is difficult and will only be accomplished by you leaving the Us and reentering the us on a student visa, which will almos be impossible while married to a citizen.

You should understand that you don't have to continue in your marriage to your wife to get the conditions removed on your green card. You can still get the conditions removed if you are divorced so long as you can prove you married your wife in good faith. And if you are divorced you may file the application to remove the conditions by yourself without needing your wife's signature. You should definitely discuss this in more detail with a good immigration lawyer before you make a decision to abandon your residence and try to return as a nonimmigrant. I think that's likely unnecessary and that you will probably be able to keep your conditional residency and ultimately remove the conditions on your residence even if your marriage breaks down.

I agree with my colleagues.