What product feature prioritization framework should be used for a product developed for both internal teams and external customers? How should features be prioritized?

there are multiple prioritization framework but here i am using RICE where r refers to reach,i refers to impact,c refers to confidence and e refers to effort.reach means with this feature how many people are getting affected,impact tells that how much our feature is positively affecting to both internal team and external customer.Confidence refers as how much confident we are about the feature and the last one effort refers as how much resources eg.money,time we are investing  in it.we calculate a score for every feature by multiplying reach,impact,confidence score and then divide it by effort score .now we want to select the best one with the best score.