Setting up a plow is an art form.

You need to get the pitch, yaw, & angle right, as well as side to side width. Changing one of these will affect the others in some ways.
If your problem is the plow not digging into the ground deep enough, one of 3 problems:
1. Very dry & compacted soil.
2. The plow lay (bottom cutting blade of the bottom which we can't see in your pics) is wore down, esp in the front point. Sometimes they look ok, but compared to a new one, are worn out.
3. Your top link is too short. Screw it out some. (In a very screwed up world, the top link could be too long, but not typically....)
One or all of those is the reason it's not digging in.
Then you'll go on to the next problem.

Note that the first round of plowing you need to lower the right side of your 3pt to set the right side down about 7-8 inches. After that your tractor wheel will be in the furrow that deep, and the right arm should be raised back up to normal. The first round is more difficult to make.
Also, an old rusty bottom with paint or dirt on it is hard to get started as well. The soil won't want to flow on it, but will stick instead.
--->Paul