Gotta quit fallin WD...
I'll bite my tongue about you not having a motorized mule...Ain't easy though.
One way I've muled brush on shanks mare (on foot) is to take several feet of rope and throw a loop in each end by tying bowlines.
About a three inch loop one one end ,and a roughly foot diameter loop in the other.
Lay the short loop on the butt of what you are dragging and run the other end of the ropes loop through it then draw it up tight. Use the bigger loop for a hand hold to drag with.
Be careful not to hit yourself in the back of the leg. Resistance letting loose can make what you're dragging jump forward....
If you have lots of little stuff /brush/small limbs ect. make a pile with butts forward and any curves in limbs upwards/skyward.
Then run your rope under and around running big loop through small loop to drag.
To get fancy if butts snag ground (shortening the rope can raise the load too) you can run a halfhitch on the butt ahead of your loops grip point.
A half hitch will slip off if routed one way ,and grip if routed the other. Hard for me to explain , but quite understandable when trying it out.
A stout couple foot limb section can be used for a tow handle if your gloved hands don't like the ropes pressure.
Lighter loads can help too.
Don't fight it and hurt or tire the mule (you).
An abused mule will balk and the project becomes too much a contention of a chore to have a good time..
