This is most likely not the answer you are looking for, but I would highly recommend taking these into a bike shop that has experience with the Marzocchi's. These are fairly complicated and require some speciality tools, and extremely easy to do damage that will be an expensive fix later.
First red flag is that the rebound screw does not move. A fork overhaul is probably in order, replace the seals and oil, check all the screws too make sure they are not stripped, adjust the air pressure, and so on. The bonus is a shop that can perform this overhaul, will also be happy to show you how to maintain the fork and how to adjust everything properly, and if you don't have a fork pump, sell you that as well. Trust me, these can be challenging without knowing exactly what you are doing, I am highly trained and I still have issues now and then with Suspension Forks.
I have included a video with a Marzocchi tech guy explaining a slightly newer version of your fork, Yours is basically the same.
Here is the link to the Owners Manual for your fork. If this is not correct you can get any manual for any fork they have made off the Marzocchi website under tech.
KTM Torque settings
KTM Torque settings
TF
KTM Torque settings
KTM Torque settings
\TF
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