I have to tell you, I'm not a fan of fake plants....however, your beautiful tank could easily change my mind!
You might try some floating plants. One of mine loves to recline in his Brazilian Pennywort. Some people entertain with a ping pong ball. When I feed my guys, I sometimes have them chase my finger to the top and then drop a pellet or two.
Willie has learned to jump for his dinner. If he's ready to eat (I guess that's why he does it) he'll jump at nothing. Maybe he has *me* trained.
For tank mates, you could investigate getting some male Endlers or a shoal of six or more Pygmy Cories. With all the cover you have, they should enjoy your tank.
Unfortunately, sometimes, I think, Bettas just tail bite.