the best place to train after reborn is the Sea lord's warehouse. You can find sharks there lvl 150 - 151 with 2k HP. But if you have doubts you can survive, just go to Hanging Garden and find tree monsters, they hit less, and they have a looot of respawns, they are lvl 100 - 110, with 1.2k HP, and just set your remote to run when an Eagle attacks you ^^. This place is good even for lvl 60 reborns up until lvl 100. After that I really suggest for you to train with Sharks.