To reset the skill place ask-states.json in the .ask folder and skill.json to the skill-package folder. Running ask deploy after will recreate all the infrastructure again

ask-states.json

{
  "askcliStatesVersion": "2020-03-31",
  "profiles": {
    "ddm": {
      "skillId": "",
      "skillInfrastructure": {
        "@ask-cli/lambda-deployer": {
          "deployState": {}
        }
      }
    }
  }
}

skill.json

{
  "manifest": {
    "publishingInformation": {
      "locales": {
        "en-US": {
          "summary": "Sample Short Description",
          "examplePhrases": [
            "Alexa open hello world",
            "hello",
            "help"
          ],
          "name": "helloworld",
          "description": "Sample Full Description"
        }
      },
      "isAvailableWorldwide": true,
      "testingInstructions": "Sample Testing Instructions.",
      "category": "KNOWLEDGE_AND_TRIVIA",
      "distributionCountries": []
    },
    "apis": {
      "custom": {}
    },
    "manifestVersion": "1.0"
  }
}