Hi yes you can although it might actually slow things down. I’d look to max out your performance setting and paging file first.
https://www.supportyourtech.com/articles/how-to-change-performance-settings-on-windows-10-a-step-by-step-guide/
I believe you can add 16gb to your system to make it 20gb in total but acer recommends 12gb max so replacing your removable 4gb ram with an 8gb ram. Check Acer website for detailed information on this and recommended memory types for your specific model number.
Here’s a link to Acer community. Search up in here also. https://community.acer.com/en/