If you actually breakdown what most 'outer-game' is, it's basically flirting. Negs, teasing, pushpull, sexualising convo, kino etc etc
What is it? It's flirting.
What do even 10 year olds know about flirting? That it only works on girls who want to be flirted with by you (because they are somewhat attracted to you)
There is no jedi level of 'game' or super secret advanced techniques that can override this i'm afraid. Despite what people selling courses and coaching want you to believe (they would have an almost identical success/failure rate to you if they looked identical to you and assuming you are not a complete social retard)
Having said all of that, ugly guys get laid all the time. Move on instantly from the girls who 'reject you before you even open you mouth'. You can't 'convert' her from 'no' to 'yes'. Nobody can. Get better looking. Gym, fashion etc. And put the numbers in your favour by approaching more. Not all girls have 'conventional' taste when it comes to looks on a guy. Use that to your advantage. Find them girls
I'm not the best looking guy and get rejected just as much as the next guy, but on more than a few occasions i've found myself in bed with pretty 18 year olds nearly half my age (i've shared some pics in the past) who for whatever reason, decided I was good looking enough to give me a chance to 'game' them. Find the unicorns. Tyler from RSD or Tom Torrero weren't the best looking guys and they got laid with some decent looking girls (although they both of course got rejected a tonne. Something PUA learners like to dismiss)