Transmission problem?

Hello, I have a 2016 Honda Pilot EX-L with about 108k miles and starting yesterday I noticed that sometimes it would bounce back and forth between 1.5k and 2k rpms when accelerating (especially when going uphill) like I was pumping the accelerator and then would go back to normal.

Also for a while now the transmission has felt a bit rough like a kinda sluggish or dragging feeling when it downshifts and just not very smooth in the lower gears. I came from driving an 05 Avalon so it didn't feel all that abnormal. I'm thinking a transmission fluid change will help but would appreciate any advice.