I'm not too mechanically minded, but I'm pretty sure that my passenger side cv joint needs attention

The spline moves in and out approx 4-6 mm and there is also movement side to side.
Is there a fix for this or does it need a new replacement ?? Expensive ?? A DIY job ?? With the wheel on and jacked up there is quite a bit of play

which probably explains why it started wobbling at 90kmh.
I've checked the drivers side and there is no play at all in that side. Vehicle is an 85 Isuzu County.
It looks like this ...
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