right click on the layer in the the layer stack/dialog, then select Alpha to selection in the context menu, then go to Select ➤ Shrink.. select 1 pixel or 2, then go again to Select ➤ Invert then hit that Delete .[Del] button on your keyboard
IMO you better off to find that font name like uploading a letter image there https://www.myfonts.com/pages/whatthefont and then search a free alternative on dafont or 1001fonts
IMO you better off to find that font name like uploading a letter image there https://www.myfonts.com/pages/whatthefont and then search a free alternative on dafont or 1001fonts