You should have worked the roots when you got it in 2022. These nursery plants are not meant to stay in that pot. It was completely rootbound.
But you also want to do this to healthy tree/plant and ideally early spring.
You say now you thought it was dead. So it lost all leaves? Or it just woke up a bit late and is perfectly fine?
This trunk has a reasonable base, but then it has some reverse taper as it branches out.
I think your best bet is to make a 3 trunk design. Try to find 3 branches that have some good movement and that are in the same plane. Prune back of prune off the others.
See for some inspiration this scan of a Japanese satsuki bonsai magazine here:
Today I took a first cut (literally) at my Hino Chrimson Azalea. This is a $12 Costco find and my first azalea. Where I started. I only had a little time today, so my goal was take off the top soil and resolve some pinwheels/whols oh the trunk and primary branches. I already had some...
www.bonsainut.com
You need to pull the trigger. If nothing else, work the root ball and prevent any more reverse taper. And find 1, 2 or 3 branches that will actually be your trunk/leaders try to force the growth to go into that branch by pruning back the basically dominant other shoots.
Likely, growing this tall and slender is the way to go.
You can prune some branches off flush. The thicker ones, you can try to leave just a few leaves and prune them off completely in 1 to 3 years.
If you can get a sacrificial branch below the area where you now have reverse taper, that owuld be geat. But likely that would require some sort of chop to get backbudding in that area.