How to win?

I'm currently on the biggest losing streak of my life. Tried all kinds of OP scripts (Skywrate, Arc, Zeus) to help win but inevitable. Which is the most OP script currently?

Scripts don't win you games, they just help you increase your skill ceiling. Hero assemblies help you combo as fast as possible and with great stability, visual scripts give you information that pro players notice by themselves. It's still your job to understand when to combo and what to do with info that visual scripts provide you. You probably are really close to your skill ceiling, so if you want to get higher MMR, I suggest you to improve yourself by watching some pro dota