I have invented a number of new mnemonics and I am wondering whether there is a part of SE where I could answer my own question about what is a good mnemonic for something with my own mnemonic. For example: Question: What is a good mnemonic for the light primaries? Answer: The initials of "Roy G Biv" are RGB which recalls red, green, blue which are the light primaries.
You could try the site the mnemonic is about. Some examples of lists of mnemonics:
and more specific ones:
Since mnemonics are part of education, sites which focus on teaching/learning a specific subject might have those questions as well:
(but there's no site in the network for physics educators or science education in general).
But honestly, I don't think a self-answered question about a mnemonic you invented is going to be well-received. IMHO you're better off posting it on Twitter or other social media.