Is this correct? good things will happen
If I want to reply to someone who misses the old days, I want to say: don't worry good things will happen in the future too.
걱정하지 마세요 앞으로도 좋은 것 있을 거예요.

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I would say 걱정하지 마세요 앞으로도 좋은 일이 생길거에요

If you are under 21 you can say 걱정ㄴㄴ해 또 좋은일 생김 ㅇㄱㄹㅇ but only in massager

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걱정하지마. 다 잘 될거야.