I disagree with the part about high volume calisthenics. I did strictly calisthenics movement workouts for about 4 years straight . I found a way to replicate the "heavy day" "light day" pattern that I used when l was lifting.
On the heavy day...for more resistance I would do calisthenic movements in
mechanically disadvantaged positions.
An example of mech. disadvantaged position is the simple wall pushup,,,,,feet flat against a wall.....body like this
Doing 3-4 sets of these > person doing multiple sets of standard pushups.
There are ways to make simple dips, pullups MUCH more difficult to do..using just your body positioning.
And then heavy duty bands, weights vests,chains to kick it up a notch.