Re: Trouble with becoming a Magician in the Sims 4
@Elisetv, you are supposed to be able to reverse the Mermaid status by eating another piece of Mermadic Kelp (that is, if you ate Mermadic Kelp to become a Mermaid in the first place! If you just made a Mermaid in CAS , then eating one piece of Mermadic Kelp is supposed to make your Sim a regular human. 😉 )
However, I've heard that there was a bug with this, but it might have been fixed by now.🤔 So, if you try eating Mermadic Kelp to stop being a Mermaid, you might want to save your game right before you eat the kelp.
To get Mermadic Kelp you can either search the hidden cave (I think it is by the shipwreck lot) to find it, or if you have enough Aspiration Points, you can purchase Mermadic Kelp with your points from the Aspiration Store panel. You can also buy it in Build/Buy Mode if you use a cheat. Bring up the cheat box and in it type bb.showhiddenobjects and press "Enter" . Then go into Build/Buy mode and search for Kelp.
Also, you can stop being a Mermaid by using a cheat. This and more is explained in Carl's The Sims 4 Guide's section on Island Living cheats: https://www.carls-sims-4-guide.com/expansionpacks/islandliving/cheats.php
Please update us on if you are able to get your Sim to stop being a Mermaid and to become a Spellcaster! 😇