Advice for Hard level Geometry

Hello!

So I’ve been using this program for a while and it’s great. However, when it comes to the Hard level geometry problems, I have a difficult time identifying how to move forward. My accuracy for Greg’s Hard level Geometry is really poor and it’s freaking me out a bit. If anyone has any advice, I’d appreciate it. It’s like I draw the image, make my markings, and yet don’t see the path forward.

Even I feel same, someone please help.

But one small thing. Everytime I see Triangles i just think can I bring 30 60 90 or 45 45 90, for all others sum of angles and some properties on angles, But I always end up taking more time.