Sagar the reason why you are not getting better is because you are bored having reached a plateau. After I could solve, I found out I regressed and algorithms started to fade. It's just like muscle. Use it or lose it.
And best way to challenge it is try a harder weight. Blindfold.
This video is fantastic. If I ever go down this path, this will be my target. But just like anything you can devote lifetime... I think I will stay happy with my sub-5 minute ability.
