Picking up a 7’ tomorrow actually. Been on order for a few weeksLand Plane Grading Scraper. Another implement used to smooth out driveways or tilled land. The beauty of this implement - almost zero learning curve and it does a great job. Kind of like a high tech woven fence drag. Just hook it up to the 3-point and pull it.
With your current setup, a chisel plow could help break up debris, making it easier to collect. You might also try a landscape rake or drag harrow to gather smaller branches. If hiring a dozer isn’t an option, waiting for your grapple might be the best long-term solution for efficient cleanup.