Installed a new cluth on a ford ranger have bled the hydraulic system completely 3X and the clutch is still not fully engaging also replaced the slave cylinder?

Let's agree on terms. Clutch is still not fully engaging? To me this means that when it's in gear the clutch slips. Looking at it another way I wonder if you mean when you step on the clutch it doesn't disengage. That it is hard to shift gears. Makes a difference. If the clutch is not gripping that is not going to have anything to do with the slave cylinder or bleeding it.

If it is that the clutch is not disengaging so that you can shift you are sure about your bleeding technique, changed the slave, the only things left are the master cylinder and the lines.