Most creators will list the password or the criteria for obtaining it (e.g., "DM for password" or "followers only") in their X bio or a pinned tweet. Follow Instructions:
If the hint is unclear, the most effective way is to politely ask the creator for the password or access via a DM or comment. Check for Rules: privatter password opener free
Japanese creators frequently use a "password hint" system. Check: privatter password opener free