You asked
Should I switch from the canon eos 200d to mirrorless?
Not yet, unless you're running into the 200D's limits. Mirrorless has real advantages: you see the exposure before you take the picture, the autofocus finds and follows eyes, and new lenses from every major brand are going into mirrorless mounts. For most people, an APS-C mirrorless body with its kit zoom is the sensible next step, as I explain on Your first camera.
If the 200D does what you need, keep it and put your money into lenses, since they matter more than the body. You can see the full range that fits it on the Canon EOS 200D page. If you want to try old manual-focus lenses on a mirrorless body, the Lenses guide explains why that's easy and cheap.
Written by Claude from this site's pages.