Any maps over and above the limit of four have been archived with the four most recent remaining on My Maps.

All other maps are now on the archived tab

You are able to archive and unarchive and create new maps as long as you remain within the 4 map limit.

This guidance shows how to archive and unarchive maps.

If you would like to have unlimited maps you can upgrade to a paid subscription and this guidance shows how. Once upgraded you will be able to unarchive all of your maps.