I have found you can remotely perform an energetic banishing (or any spiritual banishing you choose to use, on a person or space-imagine it’s being done around them instead of you) if you either have knowledge of the person so that your mind knows who you are directing it to you, or if you can follower their energy backwards from say a user name like you might to give a tarot reading online.
I like to use the sword banishing on people who are aware I do this and are at a distance from me.
If you don’t feel confident doing this you can send a spirit to do it, but depending on the persons beliefs they may pray against the type of entity you choose or otherwise have protections that make it more difficult to do, even though it’s well intended.
Archangel Michael comes to mind but there’s many protective entities.
I’ve also have sent Luna (from this above link) to individuals who didn’t believe they could summon her themselves, or for someone trying to help a loved who whose eyes seemed to be closed to the issue.
Luna specializes in protection and shielding and warding and removing/killing parasites that can’t be sent away, repurposed or otherwise removed.
She was deigned to be used by those who have no idea they have a problem and as such she can usually figure out to navigate through an individuals defense systems in a manner that is not detrimental to the individual, particularly when they are inflicting self harm or not strong enough to help themselves.
Sometimes she needs sent repetitively over the course of several days to eradicate a deep seated issue. This seems to particularly true when the individual is feeding the issues with their responses and unaware of it.
I can’t speak as to which method would be the most effective for you, I would personally choose the one from everyone’s suggestions that feels like it had the best of odds of success or get a reading asking something like how should I handle this situation.