You need time Art. It’s okay to still feel the way you do. You saw her for over 8 years. Those pangs will be there.
Maybe you could have something like a graduation ceremony? You don’t need the whole gowns and everything, but just have a small party got yourself and acknowledge how far you have come. Write a letter instead of a speech. You’re moving on to a new chapter in your life. You could also always go back for a one off session if you wanted,
Could you also spend some of the therapy money on doing something fun for yourself either each week or monthly.