My daughter went from veterinarian to biologist after first year. She's having a blast doing government temp jobs for experience before going for her masters. In fact right now she's riding around the prairies of Kansas on an ATV after prairie chickens
My advice? Find out what the up and coming fields are, choose one that you would actually
enjoy doing and go for it. Life is so much better when your job isn't work but something you look forward to doing every day.