Terraria Not Starting

Hi! I have a weird problem.

So, I've been playing Terraria since 2012 through Steam. I've always had lag but it's gotten worse recently. So, I went online to look for ways to make it run faster. One of said ways was to change the OS compatibility settings from Windows 10 to (I think) Windows XP 3(?). So, I did just that, through the task manager. You see, the thing is, I closed the game to try and refresh the settings... And now it won't open. And it's a weird kind of "won't open". On Steam, the ring around your profile picture that turns green when you start a game up does just that, except after ~15 seconds it just goes back to blue, meaning it closed. I've uninstalled, reinstalled, removed and replaced all my files, reinstalled Microsoft Framework 4.5.2 (I believe)... And nothing. I've also verified my Game Integrity, and have been searching through forums for my problem for a while now. Seems no one has my problem.

TL;DR Changed compatibility settings, game won't open and teases me
 
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