We plan a lot for what to do before and during a presentation, but not much for what to do at the end -- or what not to do.
I'd like to remind you not to dwell on the things that were not 100% perfect. Yes, it's a good idea to go over the presentation and make notes on what worked and what didn't work so well. But make your notes and move on.
If something didn't work well, was it just the wrong audience for that material, or does the material need an overhaul? You can't determine that from one audience, by the way, so you might want to let it ride for another presentation or two.
If you were off the mark, what do you need to do differently next time? Was your preparation lazy? Did you prepare your words but not your body or your mind?
If things didn't go as planned, don't be too hard on yourself. We all have "off" days, and the audience rarely has the same perception of your presentation that you have. They are not viewing it microscopically like you are; they are unable to read your mind or feel your distress.
Plan in advance, as part of the affirmations and positive self-talk of your preparation ritual, not to dwell on the negative.
You can't change the past. It's over. Look forward to your next presentation as an opportunity to do better.