You've successfully created an Alexa skill using Voiceflow and GPT-4. First, set up a new Alexa assistant in Voiceflow, adding necessary variables such as OpenAIAPIKey and user_reply. Then, populate the Open AI Settings step with your API key and Org ID, if applicable. Next, create a Javascript Step to initiate the variables and push content to the messages array. The following steps involve handling user input, generating responses using GPT-4, processing GPT-4 responses, managing conversation flow, testing, and deploying your Alexa skill. Finally, test your assistant in the Voiceflow test tool, make necessary adjustments, publish it to the Amazon Alexa Developer Console, and have fun exploring the capabilities of OpenAI's GPT models.