Help me please I'm so upset

My coolpad catalyst had a pretty bad display so I decided to see what I could do on YouTube it told me I should root and I did with kingroot then some guy told me I could change the DPI for better resolution but it was a troll he had me set it to 360 I tried to reset but its still there its a brand new phone and now everything's so zoomed I can't even go to the home page please help mei paid so much money I saved up

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