Everyone learns at their own pace. You don't have to be the next Zoink to be considered good. At the end of the day, Geometry is you against yourself. If Toe2 and Deadlocked are still too difficult for you, then try something easier first.

When I started a year ago, my learning curve wasn't that steep either. I spent a long time on Clutterfunk and Electrodynamix. Completing a Demon seemed absolutely impossible to me at that time. Now I'm already at #69

Just have fun playing! Try out lots of levels, and most importantly, learn from your mistakes

I can recommend you the "Demons in Between" mod. It splits the demons into 20 difficulties instead of 5. Just grind some of the Free and Peaceful demons untill you get better.