First off, there is weak protagonist identification here. “A group of friends” tells us little about the characters we should be rooting for to succeed. This might work in a slasher film, but probably not the best approach in a character piece. I’d focus on the leader of the group (the one you spend the most time with, or the one with the most to lose if the host commits suicide) and build your logline around him/her. The stakes also seem pretty low here. The host has been diagnosed with an incurable (and presumably fatal) disease. What if they can’t convince him to commit suicide? He dies in a few weeks, anyway. You need to find a way to ramp up the stakes. Has he not told his family? Does he have important things left to do? This also sounds like a movie that is all talk. Maybe try to think of ways that can dramatize this more. Instead of having to “convince him”, maybe have them “stop him” or “prevent him”. At least then there is the opportunity for action. Good luck!