Let me add a tiny suggestion: sometimes even old, and obsolete has value. There might be an intermediate step in the paradigm or exercise that will suit your mind better. For instance: I failed twice at the calculating change problem in courses (Coursera, SICP). I find a variant in an old Caml problems book, that made me able to revisit the change problem and solve it on my own.

Seek for stimulation and keep growing. Cheers.