If I missed a day of court ordered community service what would be the best thing for me to do ?

You need to check with wherever you are doing the service about making the day up. Perhaps by doing extra hours on your regular day or doing an extra day. Then they may not report the missing day to the court as you have made up the time. If you have a hearing coming up be honest with the judge. You may also consider discussing it with an attorney.

Go to court where you signed up and reschedule. You can usually do it once without a problem.

Go back to the Court and ask for a new date for the service.