I think i do, you would want to create a blueprint within the content browser wherever you store things and create a special save, then create a variable in the save itself and make it an array (this allows players who just join create their save data, just use a add modifier to the array so the array starts collecting all their data). you would then make it so when new players join the ranked system it starts collecting points (which would simply be a a variable struct which would contain at least one variable that is an integer/float. You then proceed to calculate the amount of points collected each match based off their performance eg kills, skill, and anything else. then take the points and add them to the float/integer, save it and then apply in the adjusted widget forward. If you want a tutorial let me know.