Beyond what’s been said...
One question was asked and not answered:
What’s your usage like?
HT to Music?
Me, I’m a music first kinda guy... lately at least 95% music to HT.
That kinda usage should focus your upgrade.
I agree with the others that a second matching sub should be high on your list, regardless. If you do use your rig for HT, a solid center would be worthwhile.
Beyond that, if you are into HT, then at the very least you should be looking at the next step which would be surrounds. A proper 5.2 setup for multi-channel music an HT is worthwhile...
I hat still goes back to how you use your system and where your goal and values lie.