The last part is to walk from Maicao town to the most northern point of mainland continent of South America (Cape Gallinas) - distance 180 km, approximately pace 25 km per day, duration one week.
In Maicao I will try to sell the bike, take a minimum baggage (excess leave somewhere in Maicao) and walk to Uribia. From there, trackless through the desert wilderness, towards the cape. I think there will be some cars, but apparently there is no official track. If anyone knows more details, please help. In any event, I feel confident on the land and I think I can handle this stretch. If I anyway get to Colombia, it won’t be any power to stop me to reach my goal.