I make use of time blocking to group similar tasks together - it really helps me focus and also ensures I set aside dedicated time for important jobs, rather than them getting squeezed out by other commitments.
I block out a few hours each week for admin, marketing, and networking, for example. That way these essential but sometimes tedious tasks don't dominate my whole week or get left until the last minute, and they are contained within certain boundaries. I also try to keep some blocks free for any urgent or unexpected tasks that arise, which gives me some flexibility. It's a pretty simple trick but a real timesaver!