Service Manual:
Manual
pp. 36-41 show memory replacement. Manual says 16 gb is the max. You have a single 8 gig module now and an open slot.
Actual max is 32 gigs or a pair of 16 gb modules. Adding a second 8 gig module to bring yours to 16 would likely be all the improvement you need.
On your Intel Core 8th gen the right memory is
https://www.amazon.com/Timetec-PC4-19200-Unbuffered-Notebook-Computer/dp/B07FF92ND3/ref=sr_1_9?dchil...
Post back with any more questions and please accept as solution if this is the info you needed.