You made it worse. Not worst! Worse and worst are comparative and superlative forms of the adjective bad. Worse - comparing two things (objects, ideas, places and so forth). In your example, "it" is worse than it was = comparing. Worst - one thing is inferior to a group of other things. It is the worst restaurant in the entire city.

It’s ‘worse’ not ‘worst’. And it means that something has become more negative due to specific actions.

It's highly unlikely you'd use "made" with "worst" as an adverb. Much more likely is "You made it worse," as in, "you made this situation worse rather than making it better" (here, "worse" is an adjective, not an adverb). It is possible that you might use "worst" like this: You made it the worst. (superlative adjectives like worst and best need to have "the") You made it the worst day ever. However, "worst" can also be an adverb: The first singer sang best; the third singer sang worst. Since when "best" and "worst" are used as adjectives they need "the" before them, you'll often see this happening with the adverb, but it's not necessary: The first singer sang the best; the third singer the worst.

The correct expression is 'you made it worse' which means that you have done something or said something to make the situation or problem worse. A more formal equivalent would be 'to exacerbate the situation or problem' Hope this helps!