A relief for cause report is very serious. These are rare events and therefore they receive a lot of attention from promotion boards and quality management boards.
I would encourage you to read AR 623-3 and DA PAM 62-3 as they pertain to appeals and then I would encourage you to submit your appeal if you meet the requirements stated in the above references. Keep in mind that if your appeal is your way of telling your side of the story and may be of assistance in preventing the quality management boards from removing you from service should your appeal be granted in whole or in part.
You have 3 years in which to submit your appeal based on AR 623-3 dated 31 March 2014. In addition if you can obtain 3rd party statements that can assist you in sharing information as to why the relief was inappropriate, exceedingly harsh, unwarranted, etc. this would be in your best interest. Typically these statement should come from individuals that were present and worked with you at the time of the relief and preferably senior in grade to you.
While the appeal is a long shot you should seriously consider putting together a professional and well structured appeal. This could be the deciding factor in maintaining your career and it would be best to file the appeal prior to potentially receiving notice from a QMP board.
You should also check into the QMP process and see if you can write a letter to the QMP board. If possible support this with letters from 3rd parties.