How can I improve CACHE TTL for better mobile performance?

Technical Q&A
,
1

I worked a lot to help a friend to get as high a score as possible in googlewith his store

For the moment,I`m ok,but can be better (I do not understand why the score fluctuates on mobile performance, among others) :

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I have this problem in gtmetrix:

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this is the webiste (maybe it helps to figure how to do that :disappointed_face:

artor

I try to make it 100% :grinning_face:

Any ideas how to change CACHE TTL ?? Thanks