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Download MSI Afterburner and create a aggressive fan curve (100% fans by 80C) and see if that helps.
https://www.msi.com/page/afterburner
If it doesn't help much then check the front of the case and see if it's possible to add some fans for intake.
Another option is to replace the thermal paste on the GPU (MX4).
Leaving the side panel off will help lower the temp but you'll find yourself cleaning the system of dust more often.