Kanji- Onyomi Readings Are Difficult

Hey all, I am studying for JLPT N4 for this December and I am getting the gist of learning Kanji. Thanks to this forum for making me understand that learning vocab significantly improves one's Kanji comprehension.

However, I still find Onyomi readings difficult to remember. Many Onyomi readings are similar like – kuu, shu, kou, ko, ka, ki, etc. This is making it very hard for me to memorize even though I know the Japanese meaning/reading.

Right now, I am brute forcing my way to memorize them, but is there a better/efficient way to study these? Or am I looking it in a wrong way and it is part of "Trusting the Process" ?

Arigato Gozaimasu in advance!

by prabalxp