It's not the OC. It's the 1000HP cpu sitting in a go-kart frame. It'll be ok for the little stuff, hanging out in the driveway etc, might even jump on the gas once or twice for the fun of it, but sooner or later youll really jump on the gas for a good tire smoke show and that cpu is going to tell you it's had enough and twist that go-kart frame up like a pretzel. The VRM's and power delivery circuitry on those uber low budget motherboards was designed more for the Pentium/i3/i5 series cpus, not the i7k or i9k's. The motherboard will literally bottleneck the cpu performance or overheat and cause stability issues.
It's also your primary core component. Everything bolts to it. Ram, cpu, fans, storage, psu, cooler etc. Replacement literally means tearing the pc completely apart. Better to get it over with from the start, a gpu swap or ram upgrade are easy. No point in swapping everything out, just to tear it all out again for the mobo.
Gamdias doesn't manufacture psus. They are just a vendor brand. The psu is built by someone else, like FSP or SuperFlower, who then puts Gamdias stickers and paint job on the outside. They are quite popular in South America and I've not seen any real horror stories about them, so while it might not be Corsair or Seasonic label, doesn't necessarily mean it's trash and totally unreliable.
You can do the upgrades any which way you want to, your parts are decent enough individually to handle that.
The 212 can handle a 9700k at stock values. It's basically equivalent to what would have been a 'stock' cooler if the 9700k had come with one. That said, it's stock. So expect heavy gaming sessions to have pretty high temps, that's unavoidable. When cooling a possibly monster cpu output, bigger is better. Not always bigger cooler, just bigger capacity. The 9700k can hit @ 200w with just locking all the cores at max turbo. No OC changes or voltages or digging any deeper than a simple single 'enable' in the bios.
The 212 is a 140w budget cooler. You'll find out fast that it's inadequate for anything over bare-bones stock. That means twin tower coolers, 240mm or bigger AIO's, single tower coolers with a 200w+ rating etc.
For air? Noctua NH-D15S/U12A, Sythe Mugen 5 Rev. B, beQuiet Darkrock 4/TF. You can fit upto 165mm cooler in that case, so none will have any issues.
For liquid? Fractal Design S24, Evga CLC 240, Corsair H100i V2 if looking for 240mm, Evga CLC 280 or nzxt Kraken X62/X63 if looking for 280mm.