Aquariums: Worth building out a tall hexagon 20gal?

TLDR I hear it’s a pain in the ass to do any meaningful aquascaping in this tank. Is it worth completely redoing it to go for a natural, lush, relaxing look? And harnessing the hexagon-ness.

I have had this hexagon 20 gallon from Aqueon for 10 ish years, and up until a few months ago it’s always just been a decoration and not really a hobby. All fake plants, castle, cartridge filter etc etc.

But recently I’ve been looking into getting more deep into this. Nice lush, natural, hardscaped tanks are what I love. I’ve been playing around with a few plants in my tank.

Right now my stock is low after the tank got hit with a bacteria infection I thought was ich. This is a couple months after another ich breakout.

2 scissortail rasboras, 2 mollies, 3 platys, and 2 minnows are all that remain.

How would I go about re doing the entire tank with this stock? Would it be realistic to keep them in a 5 gallon bucket with a heater and bubbler for a few days-week while the plants grow in? Also would like an easy quarantine tank setup, maybe I could keep them all in there instead while I re-do the hex tank.

But is this hex tank even worth building in, with such a small but tall footprint. Maintenance is not ideal already. I feel like I would only be able to do a central kind of scape, with a big mountain of rocks and wood in the middle. Ideally reaching towards the top of the tank. Lots of caves and passages, plants coming out of the rocks all the way up, etc. and I’m thinking a honey gourami or two to be the centerpiece fish.

I’m also concerned about the light requirements. With such depth. And I don’t have a lot of room to put lights, see my LED bar setup in the picture. The lights are turned down right now because of the sickness.

What do you all think? Worth it for my first legit tank? Or wait and get something different.

I’m just in an “in between time” and would appreciate your experience and advice.