Wrong time of the year to repot.
Repot in spring as buds swell.
Also wrong time to chop both in time of year and if the leaves were dying, the tree is weak.
Spring is also the best time to chop so it has all the growing season to grow and recover strength
Might be best to leave it where it is next year if it survives and do more work in spring 2026.
Remember bonsai is a marathon not a sprint.
Patience