Your onX account is currently limited to 1,500 Markups (Waypoints, Lines, Shapes and Tracks) in order to maintain a high level of responsiveness and functionality. This is a limit on your account, so if you have Memberships for more than one onX App (Hunt, Offroad, and Backcountry), you will be limited to 1,500 Markups across all three Apps.
There are a couple of strategies you can use to avoid running into problems with the Markup limit:
Delete unneeded Markups: If there are markups you don't need anymore, we recommend deleting them completely from your account. Tap the three dots in the My Content Menu next to the Markup you want to delete, then tap "Delete" in the Options Menu.
Export and store: If you don't plan on using a set of Markups anytime soon, but don't want to lose them forever, you can use the Export function in Web Map to store them on the computer as a KML or GPX file.
Please be aware that KML and GPX files do not support onX colors and icons, so only the position and name associated with a Markup will be saved in the exported file.
Exported Markups can be restored (except for the colors and icons) using the Import feature.