box elder bugs inside bedroom
Repeated vacuuming is what we usually advise with nuisance insects like box elder bugs. As you may know this species doesn't feed on people, pets, homes or furnishings but just tends to cluster on buildings and trees and be an annoyance. Just continue vacuuming them up until they are gone. Then, try to find out where they got in and seal them out.
If you have a wet/dry shop vac you can put some soapy water inside to drown the insects and reduce the chances that some might get out of the trash or wherever you dump them.
You can read more about how to deal with box elder bugs and similar creatures here: https://today.oregonstate.edu/news/insects-and-spiders-out-find-shelter-winter
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