How to make a list where you can't lower the score, only improve it

How to make a list in which the punctuation cannot be lowered, only improve it.
I am using the extension [[FREE] LeaderBoard Extension - Sort Users Score!]]([FREE] LeaderBoard Extension - Sort Users Score!)
For example if “Jack” has 10 points, play again and get a score of 20 points. But then you only get 5 points and this is where you don’t have to put anything and follow the 20 points.

Please explain me a way to do it, even if it is not with the extension.

Just use if then else along with logical sequence blocks… Enough

Thanks, I’ve already tried that, but now I’ll keep trying it