The materialization of fear can only be solved by facing fear. If you want to treat it, it may be cruel to face it, but this is how psychologists treat it.

And imagination. This is easy to say, but difficult to say. Find out why children are afraid of things first, and then you're talking about making them imagine that things are close to that thing. Lovely things are the best Then you can show them to him with your imagination, and then let him compare his imagination. If it's a little better, take it away and let him imagine only one thing he's afraid of. This is also a kind of treatment.