Hi Janet - I'm pleased to say that there is no limit to the number of public routes you can save and share. Are you perhaps referring to the route finder? There is a limit to the number of routes that can be shown on the map at any one time in the route finder but you can zoom in and refresh the search to see more at a local level.
only recently discovered this site and the maximum number of routes has been reached. My reason for joining is to share good walks with people rather than a personal fitness tracker so I think my additions would be generally useful to a wider community than myself.