Before leaving system, we should attempt resupply and repair of all systems, with a full systems test.
It might also be amusing to seed the rocky terrestrial planet with the carbon dioxide atmosphere and icepack surface with engineered lifeforms.
(While the low light of the star is insufficient to support life directly, there is a large moon on which we can construct a long-term system's monitor/resource allocator/factory ("Sentinel"), which we will leave to continue operations as we begin moving to the next system, and there are few other planets in the system to cause perturbations of orbits at L4 and L5 points near this planet. We can place orbital mirrors at those locations to provide the planet with additional insolation, controlled and resupplied by the lunar sentinel station. We can provide the lunar sentinel with a "fabrication test article" (one we build ourselves as a test of the internal fabricator) loom, and sufficient genomic data to continue the work after we leave (Genebank data for various microbiota, photosynthetic life forms, etc.). Outfit it with a long distance communications array, and off we go. At sublight speeds, it will take us hundreds of years to go between stars. By the time we travel between several such systems, our deposited sentinels could have made these systems much more interesting. It also increases the chances of our overall mission success, as each sentinel we leave in a system increases our odds of being able to eventually generate human life. By staying in contact with us, should for some reason we fail in our mission/get destroyed, they can cooperate to bootstrap a replacement for us, and put that replacement on-mission.)
(Remember, our goals are to create conditions suitable for terrestrial life. This system is a good "Very long term" candidate. Raw material in-system is low, but good communication between sentinels, with enough elapsed time between systems we visit (and possible interstellar supply tugs later), mean that by the time we actually do succeed in creating a viable habitat suitable for terrestrial life, a significant number of systems will have been seeded, with system monitors in place. The humans that we regenerate in the looms, and "program" with the sensory simulation units, would likely find these worlds "Very interesting". The sentinels will continue to monitor and support life in these seeded systems after we leave, and will remain in communication with us as long as is feasible.)