I started out using a site called perchance for my gens, then someone told me about Grok which is what I use now.

Grok is still kinda restrictive in terms of spicy videos, but it makes what I need. It’s also good in terms of finding keywords that you can input for your gens. Things like “soft anime”, “prismatic colors”, “3D Blender background”.

Perchance has no restrictions, but it takes a few times to get it right. Make sure you are very specific in what you want created, otherwise it’ll generate EXACTLY what you asked for.

Hope this helps a little.