I started trying popular stock alternatives. some of them as I have shared below. glow and neon make it easy to produce background effects and save time.
abstract tetragon ultraviolet light glowing neon lines
https://www.shutterstock.com/tr/video/clip-1043548504-abstract-tetragon-ultraviolet-light-glowing-neon-lines
abstract background with neon triangles loop motion.
https://www.shutterstock.com/tr/video/clip-1043548510-abstract-background-neon-triangles-loop-motion
background blue purple spectrum looped animation fluorescent ultraviolet light 4k glowing neon line abstract background web neon box pattern LED screens projection technology
https://www.shutterstock.com/tr/video/clip-1043398618-background-blue-purple-spectrum-looped-animation-fluorescent