That is a great little tree! Please take very good care of it!
Looks a little full, after it flowers for you this year, consider removing some growth to show the trunk better and create some separation in the foliage pads.
They do like it nice and moist (not soaking in a pool of water WET, but moist..). Do not let it dry out and offer some protection from really cold weather this winter. If it is getting much below 15 degrees F, protect it for the night in an unheated storage space like a shed or garage. Do not "pick at it too much, and do not attempt a repot in the winter or something like that... You have a nice tree there. Please think before you make any drastic changes and if in doubt, ask some people here- lots of good experience on this forum.
If you decide to report, wait until Spring and be careful with the roots. Some deciduous trees and more vigorous trees will take a wicked beating to their roots and be fine.. An Azalea should be treated a bit more delicate. You can cut little wedges around the edge of the root mass to incorporate new soil, but be careful going for a huge cut back and bare root repot on an established old Bonsai like this one.
Please keep us updated.