理・り shares its phonetic mark with 里・り, which you know already but whose on’yomi you sadly have to wait a while to learn (郷里)
由・ゆう shares its phonetic mark with 油・ゆ (oil), which you sadly have to wait a while to learn but probably already know a word it shows up in: 醤油・しょうゆ, soy sauce.
You are really good at creating mnemonics then. The best I’ve done is whenever I have trouble figuring whether a vocab word using 人 is にん or じん I make up a quick story about whether the word involves a ginger or a ninja.
Appreciate it At the beginning, I used to have some problems with the じん and にん thing, but not really anymore. With time, you kind of learn how to unconsciously see what sounds better, or at least your brain starts accepting the correct answers better.