Can someone give me some tips for Shen?

So yeah I recently started to play a lot of Shen again(he was my very first main,but over time I lost interest in him) after his rework and I really want to improve my playstyle a bit.

Because when the rework hit live and I started playing him again,I easily dominated my enemies all the time and got A and S ranks with him pretty much every game.

So I decided I would use him in rankeds too.....and got pretty much stomped... Either my earlier opponents in the normal games were really bad,or I simply countered them with shen,but ever since I tried using him in rankeds I feel like I've gotten a lot worse. Anyway I want to become better and hope that someone can give me a few tips.

My problems: Laning phase is pretty much the toughest part of the game for me as some enemies simply outtrade me and I don't know how to deal with them. & were pretty memoral in terms of being bad matchups for me,since Vlad simply kept his distance and harassed me(and when I was able to deal some damage to him he was able to heal himself up over time) and Garen simply overpowered me whenever I got too close to him/he got too close to me(trying to taunt him?He simply unloads his kit on me once the taunt is over,dealing more damage to me than I was able to do to him,trying to stay away from him?he eventually charges at you with his Q,if I use my E to get away,he'll simply do it again before my E is ready)

In both cases I started to play defensively(as our jungler had his hands full with the other 2 lanes),to avoid getting killed,but that resulted in them getting fed with minions alone,while I started to fall behind.

Some info about my playstyle: -E,Q,W seems like a good early game combo,dash behind the enemy with E,pull your sword through the taunted enemy with Q and use your W to protect you from his attacks -I try to position myself so that the enemy is between me and my sword,to get the most out of the Q. -I use Grasp of the Undying,hit and try to hit some minions before trying to poke my enemy -When my jungler comes top or my enemy tries to towerdive I taunt them. -Generally I play a bit more safe after I used my E,so that the enemy jungler can't catch me without it. - and are items I try to build early as they help me to get gold,depending on my enemy I might go for a bit more MR or Armor early on as well. -I use Q from time to time to farm minions if I get pushed back too. -I also use Q to activate my passive if the enemy tries to poke me.