I’d recommend following the advice from the Ministry of Foreign Affairs:
https://www.diplomatie.gouv.fr/fr/conseils-aux-voyageurs/conseils-par-pays-destination/colombie/#securiteAnd most importantly, absolutely avoid the “red” zones on the map.
The Catatumbo region is actually marked “red.”
It also states: “The security situation in the Catatumbo region, located in northeastern Colombia on the border with Venezuela, has been marked for the past 5 days by violent clashes between armed groups, which have left 80 dead and caused the displacement of tens of thousands of people. French nationals are formally advised against traveling to this region and, in general, to all border areas of the country.”
For the rest, just follow the “classic” tips...