Promotional explainer videos - any reccomendations?

Hey Everyone, Happy New Year! Does anyone have recommendations for explainer videos? Our product is a social website so we feel like we need to create an explainer video to engage new users and before posting on PH. Screenshots don't do it justice. Any luck with Fiverr or other company's that are relatively cheap to create a quick explainer video for your product? Maybe you've done a DIY video with an app or software? The last time I tried to create a video with apple iMovie it looked like an 8th grade project. Thanks! Chelsea