Garmin Fenix 5 series

I have a fenix 5x and have a custom course that has 78 waypoints but get the error that only 50 will be used and the rest won't be.

How can I get turn by turn navigation for longer routes?  50 waypoints is massively limiting and would really reduce the value of the product if this is a hard limit

I heard that maby tracks can help but where can i make a track on the Garmin conect for the fenix 5 instead of a course?

Thanks for you help

Paul