Thats not how PoE works, you will have to do some trading, depending on your build, whether you like it or not, assuming once more as i said you want to play a "I want my build to actually matter and not just die to plain mobs while leveling cause i dont have a clue.
Unless you play SSF, then good luck with RNG, SSF is a completely different game/monster cause you literally have to make a build that does not require specific uniques to be able to kill stuff at higher levels.
Sounds harsh but its how PoE is.
Like, they are adding lots of threshold jewels the last league and this, if your build has one and it wont drop, what are you gonna do, quit? Nope, Trade, they are really filthy cheap, takes maximum 5mins to trade and get one
Etc etc, small examples.