My 1st application to Amazon Associates, back in summer 2020, was rejected - despite making the 3 sales within the 1st week, I re-applied immediately, and stated in my application something along the lines of "my 1st application got rejected and I now have to change all the affiliate links manually, however I read and followed all the rules, so please can you accept my re-application, thanks" - it worked
In this scenario I would recommend that you download your product inventory as a CSV file, you can then "find and replace" your Amazon Associates ID in just a few clicks, after than import your CSV and all links should work with your new ID, this will save you changing the affiliate ID in every single product page
Another thing to consider
You have started a Simpsons collection
www.coolesthoodies.com/product-category/character-hoodies/the-simpsons-hoodies
Keep adding to it, because you will start to ranking for Simpsons hoodie searches
But I noticed there's still no H1 title?
This is a major part of SEO
It's great that you are posting regular updates
Keep it going
So in preparation for that, I have been placing all the Amazon links as "full links" not short links so if I need to re-apply, I can just replace the account id in the links. I'm also tagging the amazon products so I can easily find them.
In this scenario I would recommend that you download your product inventory as a CSV file, you can then "find and replace" your Amazon Associates ID in just a few clicks, after than import your CSV and all links should work with your new ID, this will save you changing the affiliate ID in every single product page
Another thing to consider
You have started a Simpsons collection
www.coolesthoodies.com/product-category/character-hoodies/the-simpsons-hoodies
Keep adding to it, because you will start to ranking for Simpsons hoodie searches
But I noticed there's still no H1 title?
This is a major part of SEO
It's great that you are posting regular updates
Keep it going