Anyone willing to help me with this?

Do আপনি have any hobbies (cooking, drawing, photography, etc.)? Maybe আপনি could do something related to that.

In some schools, doing a how-to on how to cast a spell may cause trouble with faculty and students, so be careful if আপনি decide to do that. I like the dream catcher idea, personally.

My best how-to's were how to fold a কপিকল and how-to care for a rabbit.

Your how-to should draw from what আপনি know and are good at. Picking something that আপনি have no অথবা little experience in, may cause আপনি to draw a blank or/and embarrass yourself in front of the class!

The magic tricks as long as feasible and not obnoxious should be OK! Magic tricks can be seen as old as they are done a lot and if আপনি don't have a good one, people may believe it to be lame. I personally like the dreamcatcher one. So as long আপনি know how to do it really well, আপনি should be great.

Cooking tutorials are pretty common and any recipe works. Also, giving খাবার from the recipe to your class and teacher to try goes over pretty well! Hope this helps, best of luck!