Have you referred to a tutorial? Turning screws on your own without understanding their function probably got you where you are. The fact that you could get into the large rear cog meant you should not have touched the inner adjustment/limit. It's a bad idea to "experiment" with mechanical systems. Google adjust rear derailleur and click on the sheldonbrown.com and parktool.com/blog results first. DO NOT rely just on videos - better to read and understand written instructions and use videos as a supplement.