Adding color to the post preview will make it more readable. Let's say, putting green/red color on the "New" tag will make this more visible. Users' eye will catch all-new posts right away.
Also space name can be a button type style to make it more readable. Something like this is in the picture below
All I am asking is to make the post preview more visible with color or button style instead of one single color, which is hard to catch.
Hope this suggestion makes sense.