If you repotted last year, and it’s been growing well, I think you’ll be in good shape. I did the same thing with a Walmart ficus I got earlier this year.
The original root reached all the way down an filled the nursery container. I took a saw to the bottom, leaving only a few roots, and made it fit into a smaller pot.
Now the root reaches half way down the pot, and has no weird gaps. It’s been growing amazingly well since. Those roots probably store a ridiculous amount of resources, because the plant didn’t even miss a beat. Hoping to get a fat, stumpy, sumo looking shohin out of it.
If you’re not going to go with a full cut, I would recommend making cuts into the trunk in the spots that you want new roots.