How can someone appear in a magazine without being an idol, actor, or musician?

Athletes, politicians, wealthy businessmen/women, influencers, etc. can all appear in magazines and that’s just naming a few. I’m not sure what the context is in which you are asking.

Quote from Dahyunia

Please help me

Depends on the magazine and what you want to do

In Germany you could in the past become part of a 2 page long comic styled photo-story, get photographed for a makeover, show your bedroom, even ger photographed for nudes, ... in teenager magazines. No idea if they still do this.

In adult magazines like for example gardening or where older women read gosip about celebrity you could send a fan letter but not a photo and maybe if they needed something and wrote how to send a pic or so that also made you able to apear on the magatine but other than that IDK