best way to improve is look at you replay. Figure out what is your weakness. Then focus on improving. You often see marc do it as well - how was I doing, relatively? Strategies keep changing and if you don't have insane micro like marc, you'll need info, scouting... The stuff marc does is ridiculous at times.
Question - Why do pros make phoenix hallucinations instead of oracles? They move at the same speed afaik and oracles are more scary, baiting the enemy into defending their mineral lines if they don't realize it's halluc. You can bait ppl into building anti-air when you don't plan on going air.
Suggestion for extending this challenge after you've peaked: learn how to use no warp gate as an opening that you transition out of into "normal" game (can get warp gate after 6 min or something). You mentioned this in a previous vid. Show that it could be a pro gamer opener.
Say what you want about the game two player, but I don't think anyone can deny that rush forge no upgrades, double expand no probes, five oracle three stalker is absolutly, positively one of THE builds of all time.
I think in the first game he made the forge as a response to the triple gate, which he may have been mistaken for a zealot rush which he wanted to defend against with a cannon
uthermal made it into one of my dreams, he let me play a replay, I was using a vehicle unit, it was like a fast car that shoots, I was able to kill drones with it, some could hide near the building so I couldn't kill them all