Don’t be vague: Be clear about the next steps or actions you want your audience to take.
Don’t overload them with Information: Don't drown your audience in details at the end.
Don’t conclude with a passive statement: Thanking your audience or giving a Tl;Dr style conclusion will leave your audience passive. Activate and engage them by making your final slide actionable. Don't forget to invite questions or further interaction.
No personal touch: Tailor your ending to your audience for a lasting impact.