I feel yah I'm always riding by myself, and it sucks. To get over this I practice dressage tests- EVEN though I don't have a clue how to do anything!
Its safer than jumping and more fun than plan ol' flat work.
I even work on trail obstacles- I got a bunch of old garden landscaping timbers off of craigslist for free. I work on walking/backing in and out of the L -trot poles, ect.
Make a new goal- Like for myself: I have to mount from the ground, even though I want the step stool =/ Or we suck at our left lead- We must go one full around the arena/pasture at least once.
Hmm Maybe even work on the ground with him since he's greenish, De-spookify him with "scary" objects. Be careful though-
You could take concepts from Parelli's 7 games- play with those some as well.
The Truth Harsher Than One Would Think