Congratulations on full NIN relic.... Although we would like to change your main to RDM, I'm afraid we have 6 RDM mains atm; If any of those miss 4 consecutive runs and/or complete 5/5 relic; they might lose their MAIN priviledges; you could main SAM and sub RDM instead, but it's up to you.
Changing main/sub takes place before the 10th of each month.