There may be other tutorials posted. I think you need to move all your remaining BTC from that wallet, and create a new one.

Preferably by using Bitkey (https://bitkey.io/) or a safe PC. Always keep this seed offline, write down on a paper. To send BTC, use a watch only wallet (with your new XPUB key), and sign the transaction in Bitkey (the Cold-offline mode)

It's just a draft idea, you can find a more detailed explanation on the other topics here on the site. But the main thing is. Create a new wallet (offline), send all your funds there, discard completely that old wallet. And never put your seed or private key in an online PC/Mobile.