Apple Podcasts can use a significant amount of storage if you have downloaded a lot of episodes. These episodes can take up space on your device, leading to less available storage. Here are a few steps you can take to manage your storage:

1. **Delete Downloaded Episodes:** You can manually delete episodes that you've already listened to. Just go to the podcast, find the episode, and remove it.

2. **Adjust Settings:** You can adjust your settings to automatically delete episodes after you've finished listening to them. Go to Settings > Podcasts > Delete Played Episodes.

3. **Limit Episode Downloads:** You can also limit the number of episodes that are downloaded. In the Podcasts settings, you can choose to only download the most recent episode or the most recent few episodes.

4. **Switch to Streaming:** If you don't want to download episodes at all, you can choose to stream them instead. This will use your internet data but won't take up storage on your device.

Remember to sync your device after making these changes to ensure that they take effect.