Ohh, I am in the same situation. I just want be able to do whatever I need to do. But as you highlighted in the title, it is possible (learning infinite A in a finite time T with possibly finite brain power B...).

The best thing I do that helped is to say "fuck you" to yourself and spend more time thinking (like a philosopher) about the world and my view on it. I couldn't really explain how but it really helps me.

So I guess I recommend trying to take an external view on your problems instead of studying to fix them as it is, to me, the best self-improvement thing anyone could obtain.