Great looking plant!
When the roots grow out of the culture pot as much as yours has - I would move up a pot size (4" to 5" or in your case a 6").
The roots are going to suffer a bit when pulled out of the pot but they will recover. You can also trim the roots where necessary without effecting the plant. Plant deep for stability in the new pot.
I would also give the plant a slight pruning after repotting.