If they are more wishy washy moderate or something like that and are frustrated with things in the world, some things could work.
Give him information, bit by bit, vid by vid, about the things that lead to the conclusion you want.
Example, he thinks that immigration is bad. You can send him vids about what is going on in places like Germany, cuckservative vids or just something from people he may like or watch that have some redpilled things to say. After they are redpilled on these things, you can further progress on other things, better content creators for him to watch, discuss things with him. Never go overboard. When you reach a point where you are arguing or are in a debate rather than a circlejerk like conversation, then you fucked up.
Only introduce ideas that naturally lead to said ideology. If you come to a liberal and tell him:>Fascism wasn't all that bad
Then you will be written off immediately.
You need to know your audience and develop from there. Once the person thinks you are evil (have a too different ideology) then you will be ignored on many levels.>Israel
Well, if they are interested in Israel, I think this would be a grade-A move:>Introduce to Israeli channel>Discuss together the vids on there that you watch and share them among each other>After some time, share one video that has some rabbi say something that exposes them (2800 slaves etc)>"Dude this one jewish dude thinks there should be 2800 nonjewish slaves"
So if this is some magapede retard that thinks that Israelis are little angels then the person might think that SOME jews are crazy and fanatic.
You can also share jewish newspapers with him (you'd be surprised how often they talk about "the jewish century ala Soros, etc").
You can pretend you too are being slowly redpilled with him. It's manipulative a bit, but it is effective. You'll just have to LARP about some things (isn't that what you're doing already?)