You don't need to be active. Just put your resume up there and update it once in a blue moon. Accept any random connection requests just to bump your connection

You don't need to be active. Just put your resume up there and update it once in a blue moon. Accept any random connection requests just to bump your connection count, and don't bother with anything else. If you have a good resume you'll get a stream of recruiter messages. You can ignore them unless you're looking for a job in which case they are invaluable because they are a free ticket past the resume screening part of the application process.