My ram is using 55-60% when Idle. How do I fix this?

[NeptuneNepty]

I tried using cmd as administrator and health check etc which was in this website, but still didn't worked. My Windows update is up-to-date, but for a year i have this problem, and this is lowering my performance really. I can't even use 2 apps at the same time, and sometimes even browsing something lags a lot. I don't know what to do, please help me.

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