Wow
Believe it or not, there are entire communities that are dedicated to the mermaid lifestyle. Members are willing to spend thousands of dollars to purchase “realistic-looking” mermaid tails, whatever that means. We all know mermaids don’t exist, but don’t tell that to the OP, who takes mermaids very seriously.
So seriously, in fact, that they were looking for a spell that would turn them into a mermaid. Of course, if you’re going to ask for literal magical spells, you’re only going to receive sarcastic answers. The answerer to this question spent more time than they should’ve to come up with this ridiculously long method of becoming a mermaid.