I would say join union and have them help you out but that won't help with current system. I am usually joining raids from my union if I see any and if I don't then I join the ones that have 20 minutes left like felix. While in the worst case I might not be able to solo it I can still take over 50% of its hp quite fast and that is usually when other people start to join. I don't bother joining raids with 4 or more people, excluding ragnarok of course.