You are mixing Editorial vs All Uses and RF vs RM.
Editorial files can be sold as RF or RM.
All uses (can be used commercially but can be used in some editorial contexts) files can be sold as RF or RM.
If you have already sold particular files as RF, you may have difficulties having these same files or similar/sisters accepted RM on the higher-paying markets. Nothing to stop you trying to get accepted onto the higher-paying sites with future images, or you could take your non-selling photos off the micros and try to get them accepted into the Macros.
But remember, just because the 'rack rate' on a page says $X, doesn't mean anyone actually pays that much. I only supply iS and Alamy and for sure I can say that's true on both of these sites - buyers are generally able to negotiate huge discounts, or find discount codes online.
Also even on the Macros, just because your files are on sale for more, doesn't mean they'll actually sell at all - you'd need to consider your competition on these sites before jumping in, and try to gauge the buying potential of the files. Even if you are the only supplier of some subjects, that doesn't mean there are buyers for these subjects at any particular site, or even at all.
Some things you can research; some things you can only find out by trial and error. Whatever you choose, you'll always wonder what would have happened if you'd gone in a different direction.