Corporate isn't my field so please correct me if I am wrong; however I was fairly certain that in the Corporate sector there are often insurance requirements which will stipulate minimum hours for crews; as a result alot of corporate operaters will require between 700-1000 hours to be able to consider someone for an FO position. So don't be surprised if you are not getting offers with at the moment with only 250 hours. This obvioulsy is not always the case and will vary between companies.
The other thing to consider is in the corporate sector you may only fly around 200-400 hours a year , hence is someone with low hours is employed it will be along time for them to unfreeze the ATPL and also a long time to gain the hours to be eligible for a command.
I know you could aim for some safety pilot work on single crew aircraft with your level of experience which is something you could do along side full time instructing.