OK, this is what you should do:
1. Get a good nights sleep and look at this after a good breakfast.
I know that sounds retarded, but you will fuck something up if you keep working on this now. I've done many stupid things with electronics when tired and frustrated. If its any consolation, this happened to me on my first attempt with this controller mod as well.
2. Look for a trace - the line on the left leading from the pad you pulled up looks correct.
3. Get a fiberglass brush, you may be able to find one in a hobby store, and gently brush part of the trace till you see silver. Make a size about the same as the pad you pulled up.
4. Now get some flux and glob it on there, glob some flux on your wire and then tin it with solder. For good measure, put some more flux on the tinned wire.
5. Place the wire down on the exposed trace and heat it up with your solder pen nice and gently. The solder should flow onto the exposed trace and make a good joint.
6. After a second or two, very gently check to see if its secure. It should be. Do not pull too hard. I did that after successfully modding my first PSX in the 90s and made it an instant fuck up. Don't be me.
You should be using lots of wire so these pads don't pull up because of tension. Hot glue is also your friend. Once you've tested the controller, I usually put some hot glue on each soldered point.
If you are careful, you can speed up the drying process of the hot glue by getting a compressed air gun, turning it upside down and spraying the glue AFTER YOU SAFELY REMOVE THE SOLDERING GUN AND ANYTHING FLAMMABLE FROM THE WORK AREA. I cannot stress enough how explosive those cans are.
By the way, Why are you doing the DB-25 mod? I told you to start with the DB-15 - its easier and it will do all the major console pads - SNES, NES, Genesis, etc.
Anyway, looks like your learning, grasshopper. Last thing, get a solder fume extractor so you don't give yourself brain damage.