Personally, I've found one of the more stimulating ways of playing in recent times has been to kind of move outside the free improvised area and work with people who are probably improvisers but they have a particular way of working.
“Wisdom prepares for the worst, but folly leaves the worst for the day when it comes.”
“At that time, we were in charge. We didn't ask. We just did. We just did what was in our heart.”