Spread the roots apart as best you can and aim them in different directions when you put it in the new pot. You don't want it to remain a big wad of roots after repotting.

A common technique to accomplish this is to put a layer of dirt in the new pot, then a cone of dirt on top of that. The plant goes around that pyramid shaped cone so the roots are going in all different directions. Then fill the rest of the pot to cover the root.

The old dirt can stay, or if it falls out, that's fine too.

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