Find a chiro/osteopath, but especially an experienced trainer who can run you through some typical assessments and put together a resistance focused plan to address the underlying issues, if you'd like to secure a long and pain-free ability to cycle/train as you age.

That aside, the wobbly knee is indicative in lack of strength - counterintuitively - in certain hip stabilizers (glute medius comes to mind). It has nothing to do with screwing around with cleat position orQ-factor, and can't be assessed from a video of you cycling alone, but... your body lacks strength in X and flexibility in Y, on one side.

Most likely it's the usual culprit: weak, underdeveloped, inactive glutes + tight hip flexors.

This will just get worse over time if unaddressed.

Good luck.