It might just be a waiting game I really love this style of tank but think some of the plants you have already talked about just need to grow in. I think getting the right scale of fish could help too, your hoplos once up to adult size will look great swimming between the trunks.
Have you thought about a plain black background to up the contrast too?
they wont grow to the full huge 8" size of more common hoplo species, their species is
hoplosternum punctatum, a less common species in the hobby, grow to only 3". I got a trio in there and they're fun little guys who hang with the cories a lot.
I thought about the black background, but I have that on all my tanks so find it a little different to have the rock sheet lol.
Perhaps I need to tweak the locations of the woods. The arch piece maybe off to the far right, with the trunks leading to it...
But the swords on the far right I think I'm going to remove. Just not fitting this tank. I'll put them in my 46 instead with the parent plants.
Some plants just won't grow. My wisteria is one. I actually have had it so long I've begun to legit just hate it. Won't grow nice. Decides to grow emersed underwater all the time then just melts, then gets holes in the leaves and just never looks nice. I've had it over a year and that pathetic clump in the far left is what I got.
But in a few days I am buying some more plants for my bettas tank, ill toss in a couple extra plants for this tank too. More hygro if I can for sure, but ill see if they have any good anubias for a larger tank too.