i have heard someone need to submit KYC level 3-4 to be eligible to withdraw.
any Stake's support here? is it a reality?
Only if there is something up with your account or in cases where there was a big win sometimes.
Under normal circumstances you don't have to go through level 3 and 4, normally not even level 2 but obviously this is changing from next January.
And, there is no stake support here. The rep hasn't been see for a while now so you better ask the official live support on site or (if you have one) your vip host via telegram. You can also ask your questions in the official stake forum and maybe some mod can answer it for you.