Need advice repairing damaged PCB traces

Hi everyone,

I'm looking for some advice on repairing damaged PCB traces. I've attached photos of my PCB and marked the areas I'm struggling with using red arrows.

The traces around the 2nd (middle) and 3rd (bottom) barrel ports appear to be damaged, and I'm trying to work out where they originally connect. I've already scraped away the burnt and damaged material to expose the copper underneath. I attempted to repair the traces by first applying solder to the exposed PCB traces. I then applied flux and tried attaching 0.3 mm enamelled copper wire to the soldered areas.

Unfortunately, the copper wire wouldn't stay attached and kept coming off.

I have a few questions:

Should I remove the old solder using desoldering braid and start again?

What's the correct procedure? Should I place the copper wire onto the exposed PCB trace first, apply flux, and then add solder? Or should I tin both the wire and the PCB trace separately before joining them?

Do I need to remove the enamel coating from the copper wire before soldering it?

Can anyone help me identify where the traces from the 2nd and 3rd barrel ports originally connect?

Would someone be able to draw the correct jumper wire paths on my photo so I know exactly where to solder each end?

I'm still learning PCB repairs, so I'd really appreciate any advice on the correct technique to make sure the wire stays securely attached without damaging the board further.

Thanks in advance for your help!