I'm very new to QGIS 3 and I have a problem. I got a point.shp indicating coastal transects long the world's coast set 500 m apart. I selected a subset projecting only the sandy transects along the Dutch coastline. From these points I know want to create a 5 km long transect inland 90° to the existing shoreline. The first picture shows the available points, second picture is a zoom-in and the red lines indicate what I want to achieve. Is there any way on how to create these inland transects perpendicular to the shore? Very happy about any suggestions, insights, tips, etc.