PowerPoint - rehearse your presentation - in built coach
If you want to rehearse your presentation and need feedback but there is no one who can help then you can use the inbuilt feature of the rehearsal coach in PowerPoint. It will provide feedback and information on how to improve the presentation which can be used to make your lecture more impactive. This is the link from Microsoft:
https://support.microsoft.com/en-us/office/rehearse-your-slide-show-with-presenter-coach-cd7fc941-5c3b-498c-a225-83ef3f64f07b