1. delete Arcgis collector app on your ipad
https://support.esri.com/en-us/knowledge-base/deprecation-arcgis-collector-deprecation-000026436#:~:text=The%20ArcGIS%20Collector%20app%20on,be%20in%20ArcGIS%20Field%20Maps
2. download Arcgis field map on Apple app store
https://www.esri.com/arcgis-blog/products/field-maps/field-mobility/migrate-to-arcgis-field-maps/