There's no "right" answer to how to get clients. You have to try different things like look for work on Upwork and other platforms. Review top rated freelancer profiles (and not copy them). Be picky about the jobs you apply to..really 300 connects?
Make sure your profile doesn't include your name in the first line. The first few lines are what a client sees in a search so make sure you use the real estate to stand out from the thousands of others who have more experience and/or more completed jobs.
Be optimistic... your first job could be around the corner.