This package is just a wrapper of the polkadot docker image as you can see : DAppNodePackage-polkadot/Dockerfile at master · branciard/DAppNodePackage-polkadot · GitHub
It is not design to do staking and validator operation off the shelf.
To operate a Polkadot validator with dappnode as root layer, we ( Luguslabs) use a more sophisticated toolling as explained here
( Since the previous blog post, sentry nodes are now deprecated and we use remote NGINX proxies)
Polkadot Validator, is complex to operate and there is risk of slashing. You have to deals carefully with sessions keys that are in the node keystore.
I do not recommend using our tooling if you are not aware of all the code and behavior behind and have a good DEVOPS experience.
Instead, the official secure setup is here :
You need also enough DOT or KSM or nominations to be in the validator list.
You may want to join KUSAMA validator program first to begin and receive some Web3 Fondation nomination for your bootsrap and reputation growth, to attract more nominators, Join Kusama’s Thousand Validators Programme