Hi
how can i transfer eth in my smart to my wallet ?

There are actually many ways to accomplish this (good and bad). The current recommendation is address.call.value(1)() to send 1wei. More info here: https://ethereum.stackexchange.com/a/78136/31933

This of course assumes that you are still writing the smart contract. If it has already been deployed you have to use whatever functionality it provides

Ok, thank you

I wouldn't make a token upgradeable even - it will not get added in any exchange if it's upgradeable

Okay, I get this. Would make more research.

Thanks 😎