Ok. What’s happened is that you pulled the copper traces off the board, breaking the electrical connection.
Our circuit boards are only two layers, so all the copper is on the front or the back. It is possible to repair this sort of problem at home with a bit of wire.
If Z,X,C, PgDn stopped working, it’s the ‘row’ wire that broke.
However, it looks like you may have also broken the wire between the ‘C’ keyswitch and the R3C3 diode.
This is the pattern of traces on the front side of the board in that area:
These are the traces on the back:
These are the electrical connections for “row 3” which is PgDn, Z, X, C, V, B:
To repair this, the next step is to figure out whether any -other- connections got broken. Do you have a multimeter handy?