You might have slipped the cable, if I were you I'd loosen the cable entirely and do whatever the installation procedure is for your derailleur
askchapo
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find the ParkTool Video about front derailleurs and follow that. It's not as intimidating as it looks! It will be difficult without a repair stand so be warned. Good luck!
also, just so you know the adjustment screws are physical limits. they'll change the maximum and minimum distance that the derailleur can go. hope that helps as well