hisbaan

Mechmarket might be a good place to check

I'm able to sort communities by new, you just have to get the header to show up by scrolling a bit. It might be hidden if you have hide on scroll on

There are custom themes if you dig a little more in that menu

I think just putting a slight shadow below the buttons would help tons

Boost for Reddit was not (as far as I know) so I doubt Boost for Lemmy will be either