Ubuntu 20.04 taking way too much ram

Some time ago I noticed a lot of ram(1.8/8GB) being used when my system was idle with only a day of uptime. I had to reinstall my Ubuntu because of some reason and now the ram usage has risen up much more. I only have a 26 hours of uptime and this is the result of free -m when my system is idle

          total        used        free      shared  buff/cache   available
Mem:      7738        3622        2810         136        1304        3720
Swap:     2047         271        1776

This is 3.6GB/8GB when my system is idle. The ram usage remains same when I turn off all the extensions too.This is way too much. I'm also posting a screenshot of processes running at this time. And this is not that my system automatically adjusts ram when I open applications, I'm only able to open very limited applications from before. This is way more than windows has ever used on idle.

Can someone please help me avoid this issue?