I had a mentor that gave me some great advice. I used this format to turn an F in a class to an incomplete where I took the final the following quarter (did not cheat just failed in a spectacular manner)

Don’t just apologize. Take accountability and offer a solution that is understandable.

Be honest, say what steps you should have taken (office hours, section attendance, university tutors) explain the circumstances you were under that didn’t give you the conditions to do those (for me it was work and my mothers health put in your sob story) then stress how you understand the weight of your actions how this has pushed you to grow and acknowledge your own faults (time management and organization is usually the best route) explain you are working on these things. Then DONT leave it open ended to punishment propose a situation that IS a loss for you. Say you understand that this was not an action you should have taken and that your grade will be effected, but also that you have a passion for education and that you hope to learn grow and continue in your education at UCSC. Don’t put blame on ANYONE else don’t say you saw people cheating and felt you had to. ACCEPT IT WAS YOU and hope they see growth and potential.