I think moving to 16GB RAM will help a lot..As to moving to Intel, in gaming especially at 1080p, it will make a difference. Playing at 1440p not so much but try adding 8GB more RAM before making a change as the RAM can still be reused on the new system and I think most of your issues will be resolved.
Oh and just to reiterate and as Captain Gadget say....FAST RAM will make a difference on Ryzen..Ryzen likes fast RAM and will make the most of it.