I'm not quite sure what you mean by "reduce". If you have data and need to store it, then its more about finding ways to do that. You are by no means restricted to MMF's built-in variables.
Maybe you can elaborate and users can give you ideas and tips on creative data storage?
It all depends on your ability to understand storing data and the type you want to store. You are not bound to just the array unless you absolutely need the structure it provides. Using x, y, and z cells in an array is useful for data that has many elements or corresponds to a matrix.
Also, the amount of data and the way you need to access it and retrieve it makes a difference as to the best means to do it.
You have many options for storing information. There are are several objects that can even load and save files with your stored data.
There is the Associative Array and the Named Variable Object, as well as the Array Object. You can even use the listbox, paragraphs in the string object, etc. There should be no problem or limit for your situation if you find out more.
I am going to recommend that you start by trying the Named Variable Object. It is easy to use and even has some similar features for values, (add, subtract, etc). It uses "keys" which are just the name of the slots for your data. You can load and save them easily. It is very simple to get used to and you can store everything you need to with it.
You can make the object global to your application and save strings or values as needed.
Example Keys:
CharacterName = Greeny
Strength = 150
etc.
Here is a tip: Let's say you want to save similar types of data, (having the same names like "points".) You can always name your keys more descriptively:
PlayerOneCharacter_Strength
PlayerTwoCharacter_Points
That makes it easier for you to keep track of what you are doing and so, it should be easier to work with and refer to your code than arrays might be without commenting.
Again, I bet other users have systems of their own that work well using other objects.
It is a matter of being creative, not frustrated. Take your time!