External graphics processor

I got a notebook with an Intel UHD Graphics 620 and an NVIDIA GeForce MX150 in it. I thought about buying an egpu for having a nicer experience while editing my videos. I don't need it for gaming or any other stuff but video editing. Can anyone help me out with that? I'd appreciate it a lot!
I don't know anything about it by myself and just asking Google confused me much.

Thanks for your help!

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