If you look at
https://feeds.feedburner.com/Juanamikelscom you immediately see that they last updated 3 years ago.
, but you appear to have deleted that feed, and set it to redirect back to your original feed.
Perhaps you should change the footer to point to one of the other Feedburner feeds.
There's some weird formatting going on. Just on the frontpage,
<div style="margin: 0px;">
appears 890 times, in blocks of 38.
Then
<div style="margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px;">
218 times.
Those alone add ~40KB to the size of the posts on the frontpage.
which 3 years ago would been 3x as big as allowed. Since then, the maximum size has been increased
to 1MB - so your feed would still be 40% too big.
So the quick&dirty fix would be to change the Original Feed of both Feedburner feeds to
depending on whether you want your feed or email subscribers to receive the full content of your posts,
or just a short summary.
The proper fix: if you don't write your posts directly in Blogger post editor but paste them in from somewhere,
then paste using Ctrl+Shift+V, not Ctrl+V ( if using Chrome or Firefox on Windows), or paste from plain Notepad.
For your existing posts , you should to reset the formatting in your posts, using the Tx button in the post editor toolbar.
(at the very least, for the 25 newest posts)