I'd be wacking the front end of the trailer tongue and starting over keeping the back of the trailer with the C-Channel. Watch for the vin
number if it was on the tongue and keep it or by act of magic it appears on the new tongue. If there is a stamped plate keep it.
A good welder wont just patch the mess up front. He wont want his name on that thing if it were to fail.
Now is the time to think about an axle
change. A frame change or just a repair. I would address all of these issues with your fabricator. or adjusting the height of the trailer.
Look for a shop that has been around along time. Experience goes along way if your paying time and materials.