To fix a loose drawbored joint drill peg holes to a slightly larger size using a doweling jig top then fill and re drill the holes with a slight offset bottom.
How to fix a loose door panel.
Dip the cotton swab into the adhesive and slide it into the seam.
Pull the swab out and slide the swab in between the masking tape and the exposed door panel.
Alternatively you can remove the door card and then working from the rear of the panel remove the fabric and then use a spray adhesive to affix the fabric back to the panel.
Take one end of the cotton swab and dip it under the surface of the adhesive in your cup.
The simplest one is to order a replacement door card.
Shift the doorstop close the door and hold a block of wood against the doorstop.
Smack the wood until the door stop moves enough to touch the door.
Flip the door over and repeat the process of removing the excess spline material and adding the wood putty.
This might sound expensive but if you scour the breakers yards and online auction websites you may find one cheaply.
The most elegant fix.