video and voice over artist

i m an anchor person ,how can sell my story telling videos,kids singin poems,commercial adds

That’s not something that a royalty free stock site would accept.
Everything here is silent.
Maybe if you have video of these things without sound you could upload them.
But you would need the correct model releases for anyone in the video. Especially if they are children.

Other than that. Not sure where you would sell that kind of thing.