After hours of farming blood echoes I've finally made it to BL544 because simply platinum was not enough for me. Was it worth it ? No. Do I regret ? Hell no. :
Late to the Game: Bloodborne — Book Squad Goals
Bloodborne - Farm for Blood Echoes, Blood Vials, Quicksilver Bullets and Sedatives - Prima Games
Bloodborne Blood Echo Guide - How to Farm Blood Echoes to Level Up Fast | VG247