isolate
>to separate a part of a situation, problem, idea, etc. so that you can see what it is and deal with it separately
DeepLで「問題の切り分け」を翻訳したら isolating the problem だった
「孤独」みたいな感じがするのがうーんという感じ？
1番目の意味だとそうなる
>to separate somebody/something physically or socially from other people or things