I have already passed N2 exam, but I can't understand this sentence...
Please laugh away by "どんなに Let's change it" ?? It doesn't make much sense??
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I'm assuming this is from L'Arc～en～Ciel's "I'm so happy" lyrics
To understand it, I think it would help to include the previous line too. With this context I would say it means
But you, don't be sad
Keep laughing no matter how much things change
The 変わっていこうと is the volitional form of 変わっていく, but that doesn't necessarily mean that it means "let's do" something, it can also be used of inanimate things.
For example, in the sentence
No matter how good their technique is, amateurs are still amateurs
the subject is technique.