Problem with leveling system

Hello All,

I am a begginer with UE, and for my game I tried to add experience level and quest system like in the video below:

everything works except Level is always 1, even though it should be incremented, no level ups occur.

Please help, did I do something wrong, or some functionality broke in the last couple of years since this video was created. If so, could you recommend any foolproof way of setting experience level system?

Video showing my blueprints, variables and functions created as per YT uploaded to google drive. Link below