There is not enough fun. Remember the soloists have a huge range you need to work outside the range. Double or half them and see what comes up. Try taking a soloist ..(non Realtracks) generate it, use a good sound device like the Ketron SD2 and change the instrument.
I am the soloist. So often I find what someone else was using for fills, riffs and runs, print that part and stick it beside the lead sheet and have a go at it. Even if it's not the Realtracks, in some cases, the audience is going ok buddy is playing an electric piano doing this and boom, there's some guy I can't see playing um um, what is that, a guitar. Better you take the musical ideas, put them into your performace, stand up, lay 'er down, and take the applause. NON?
Just my ramblings, don't mean a thing if it ain't got that baby swing my grandson loves to swirl about in at the park. Wish I was one year old again when that giggle starts. No worries....look Papa John a doggie!
Make songs now for your grandchildren, Peter et al put out the childrens song book. You have X number of days, spend 10 minutes a day making a plan Stan, and solo "Mary had a little lamb"....in a goofy hat in front of a video camera. Remember, you might not be around later to see the fun, but you can make it today....