There is not a single established piece of lore, that in any way shape or form states that souls have any limitation as to whether or not they can leave if they have the telemantic means to it.
In fact, the whole expansion establishes the exact opposite.
Literally every covenant has a private means of leaving and entering and traversing the Shadowlands.
Drakas Afterlive short has her spy on a legion world.
Brokers just go on casual treasure hunting trips whenever they feel like it.
We have ourselves opened portals to our very own capitals the very minute we entered Oribos.
When someone dies, there is absolutely nothing stopping us or anyone else to just ask Pelagos for directions and then drag them out of there.
There is nothing stopping a soul from just saving up a bunch of anima and paying their nearest Broker to port them back to their planet.
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You are not.
Ysera is not an example either.
Ysera is the only soul that had any sort of bond to their designated realm, a bond only created because her pod was damaged and the Winter Queen had to push the emergency button.