No need to mix the sats you receive on here with any you have elsewhere. Simplest would prob be to load walletofsatoshi.com onto your phone, you would then have a lightning address which if you go to your profile on nostr (& huge congrats on getting yrself onto nostr) and edit profile bit (looks like paper and pencil) and add your new lightning address into "ln address", save it and you are good to receive more sats to add to yr stack.