You have multiple problems.
FeedBurner Issue
Currently your podcast feed is telling iTunes via the itunes:new-feed-url setting that your podcast feed is now https://feeds.feedburner.com/oneextraordinarymarriage. When I go to https://feeds.feedburner.com/oneextraordinarymarriage, it redirects back to your home page (not your podcast feed). That is a huge problem. You either need to use FeedBurner or not. iTunes is still looking at https://oneextraordinarymarriage.com/feed/podcast/ so my suggestion is to go into PowerPress Settings > iTunes tab and remove the new feed url setting. Until this is fixed, the rest of this reply will not help you.
Feed Size Over 1.5MB
Your feed size is very large. If you want to maintain all episodes in your feed as you do now you will have to expect iTunes to not pull your feed as often as it would normally. The recommended maximum feed size is 512K.
Refer to Cast FeedValidator for feed size issue: https://castfeedvalidator.com/?url=https://oneextraordinarymarriage.com/feed/podcast/
Keep in mind that iTunes has an episode item limit of 300. Even if you wanted to maintain everything, you still have this limit.
At the moment your website is randomly reporting a “Service Temporarily Unavailable” message, which may also cause itunes listing delays.
This is what I recommend
Go to PowerPress Settings > Feed tab. Make sure the following settings are checked or set:
[X] Do not allow other plugins to modify podcast feeds.
[X] Accelerate feed
[X] Feed Episode Maximizer
Show the most recent: 100
The checkbox options will prevent other plugins from adding content to feeds (helps with performance), stop the unnecessary extra database queries that are in WordPress when creating the podcast feed, and remove tags from the podcast feed that are not necessary for podcasting.
If you must set the show the most recent to more than 100, do not exceed 300. Exceeding 300 is pointless since that is the hard limit on iTunes.