Have you checked the known issues thread pinned at the top?
Maybe it’s this:
https://us.forums.blizzard.com/en/overwatch/t/known-technical-support-issues-updated-april-12-2020/25/25?u=nicole-1893
There is also a known issue with Ryzen processors:
Also, small tip: Overwatch runs best on dual-channel RAM, same speed/size.