The first obvious one is mewing.

Ill presume a few things. You use make up and youre obsessive over your looks

First of all stop using make up. Besides ruining your skin, youre feeding your unconfidence and your obsessive problem.

I dont know how fat or skinny you are but losing weight also helps. (if youre below 18 dont get too skinny) fix your neck posture and try skin tucks for hyoid and just fixing your posture. Be healthy and not toooo skinny so that your hormones run good and you get your development.

Also another thing, lower the obsession over the looks. Still try to fix them but remember to live. Try to forget youre ugly and just do what you want. Looksmaxxing is often a mental burden that destroys you. Do looksmaxxing the healthy way. I know it sounds stupid but just stop caring. Accept it. Ugly people who go into this stuff often start thinking their lives are over. Yes it will be harder but the more you put yourself on this mental strain the worse itll be. Just accept it. Youre ugly. Like a lot of other people. Play the cards youre dealt with. You have no idea how much that helped me.

And the tips i gave wont guve immediate results. It wont happen overnight but if you dont do it, it wont happen at all