when life gives you lemons

Meaning: 災い転じて福となす、逆境の中にいても挫けず良い方向に変えよう

For Example:

‣ One of my friends lost his part-time job at a restaurant due to this COVID-19 situation, however, he decided to start working as a delivery guy at a pizza shop. He says "When life gives you lemons, make lemonade, right?"

この新型コロナウイルスの影響で私の友達がレストランのバイト失ってんけど、代わりに 　ピザ屋さんの宅配業者として働くことにしたんやて。苦しゅうてもベストは尽くさなあか

　んやろ？って言うてた。

‣ A: I feel like I'm not good at anything.

A: 私って何してもあかんわ。

B: Be more positive about yourself! As they say, when life gives you lemons, make lemonade.

B: もっとポジティブに捉えまい！挫けんと、良い方向に進めるよう頑張ろうで。

Synonym:

optimistic, look on the bright side