Just after the talk, take some time to analyze how your presentation went. It’s not about saying it was shit, or that it was the best ever, but about what and how you could improve. If you know people who attended your talk and who you trust, ask for their feedback. Even without that, you probably have impressions on what went well, and what went less well: write them down now. This is a great time to get ideas for the next time, when the conference submission virus hits you again!