By today what's your advice for newbie crypto investor?

let's elaborate: i'm a noob and where i live salaries are not that high to live a good and full life. i have started to invest in cryptos since right after the may peaks and i can tell my money are getting up in value. my goal is to get a good monthly salary backup with cryptos in order to have enough money to move in with my gf :)

i have the feeling that investing in btc and eth is not what i'm looking for since those (expecially btc) have reached a very high value and it's unlikely they will go up much more than this (maybe eth after eth2.0?). maybe i'm noob enough to belive this and i'm totally wrong but anyway how am i supposed to prefer a crypto over another? how do you guys plan your long term investments?

i can't find good infos about this world and if someone can help a fella get a hang on this i'd be very thankful!

EDIT: i'm getting way so much to think about, you all are fantastic guys, i'd give an award to every one of you if i could! many many thanks :)