What to write on maneki neko?

I'm curious, what would be the most appropriate message or sentiment to write on a maneki neko, the Japanese lucky cat statue that's believed to bring good fortune and prosperity? Should it be a specific phrase related to wealth and abundance, a general wish for good luck, or something more personalized to the owner's aspirations? And how would you suggest incorporating it into the design, whether it's through engraving, painting, or another method?