It seems root bound.
The "hole" in the soil is of some concern, maybe an air pocket during last repot.
Take the snail off if it bothers you.
Ants are milking aphids usually; take care of both if possible.
White cylindrical things are eggs, no?
Yes, it needs repotting and it needs good bonsai soil. Any good mixture like Akadama, pumice and lava rock (try Boon's Mix in Amazon) will do.
IF IT WERE MINE (it is NOT), I would go for a bare root repot. At the right time, with the right temperature.