How to Properly Size Twitter Images that Point to Convert Kit URL
This pissed me off for quite a while until I had enough sense to ask someone more experienced.
When you type a URL in your X post, it automatically generates a card image for that URL.
Using Convert Kit, you can go to Settings/SEO on a Landing Page and specify the Image you want to show for that Landing Page URL.
Try 1920 x 1080 for the size.
Otherwise, you will get frustrated by X always making the image too large or too small in your post.
Hopefully, this saves you a headache.