Your title is extremely pretentious, your build is poor, and your combos are basic.

SUGGESTED TITLE CHANGE:"Darius Guide - Dps / Tanky / SoloTop - Best Build Lee Sin Has Ever Seen!"

Let's start with your build, have you ever asked yourself why every higher elo guide builds Darius tanky with only a little damage? It's because when the enemy decides to focus you, if you try and build mostly damage you're going to melt instantly, and be pretty worthless versus anyone that doesn't wear their pants on their head. Conversely, tank Darius with a trinity force + hydra is still easily capable of nuking anything he wants, and he won't blow up when the adc lands a crit or the AP mid throws a skill at you. It also looks like this "guide" assumed you're fighting a full AD team, as there isn't a single MR item in there or any suggested alternatives, aside from GA, which won't save you vs any competent AP mid.

Now for your combos, they're basic and you overlooked a vital aspect of Darius. You want to AA reset between attacks to maximize hemorrhage stacks and your damage. Starting with Q is fine, but the biggest thing you want to try to do is AA > W > AA > E or Q > E depending on if you already used Q. Say you saved Q and did all that, you'd stack hemorrhage four times in roughly 1.5-2 seconds, and then pull them back into you; mix in Trinity Force procs on every AA in there and tank Darius will 100-0 almost anything in range.

P.S. I noticed that you said "In level 18 enter team fights like a tank and have no fear of the enemies.", I sincerely hope you're joking. You seem to think you can build defensive boots, a GA, and a little hp and shrug off all the damage. A late game adc or AP mid will one shot you, wait for you to get back up, and then just kill you again.

tl;dr: You guide assumes that the enemy team is entirely AD and too stupid to focus you you down.