Soil not draining well enough, any advice?

[JakeG95]

I’ve repotted my trees this year using bonsai soil I got from a good bonsai nursery

I’m unhappy with how poorly it is currently draining

I have potentially packed the soil too tight

Also a lot of my trees have been reported into larger bonsai pots, essentially growing pots but they look nice, so maybe this is contributing to my issue because there are large areas of just soil no roots

I’m only needing to water like once every 5 days if that and I live in bundaberg

Are there any tips to improving drainage or do I just wait until roots have filled up more of the area?

Thanks a lot