After the interview, you want to maintain the relationship with the host and promote the episode to your own audience. To do this, you should send a thank you note expressing your gratitude and appreciation for the opportunity. Additionally, share the episode on your social media, website, newsletter, and podcast. Tag the host and the podcast, use relevant hashtags and keywords, and encourage your followers to listen, rate, review, and share it. Furthermore, ask for feedback from the host and listeners to find out what they liked or questioned from the episode. Respond to their comments or messages and engage with them. Finally, keep in touch with the host and offer to reciprocate the favor by inviting them to be a guest on your podcast or collaborate on other projects. By following these steps, you can establish yourself as an expert in your field through guest appearances and grow your podcasting career and business.