I’ve done some clearing after forestry mulched. We typically get a rake
grapple for the skid steer and get the majority of it up. Then used a Harley rake angled to smooth the area and with it angled it will create windrows of debris you can basically get into a line. Usually only takes us a day to do 2-3 acres. The tough part is pull behind rakes get jammed up with debris and much of the debris is still sunk in the soil. Harley rakes are great for this. If it’s a option to rent one from a local place it will save you much time in the long run.