There are multiple items and resources in the game MementoMori: AFKRPG without which progressing will be quite difficult. The AFK RPG has many witches in the game and since some might be stronger than others, you can even check out the Tier List to get a better idea. You can also understand the process to reroll in Memento Mori. The term Memento Mori is Latin depicting the inevitable death and the game follows the same context with the lines "All roads lead to our Goodbye." In this post, MuMu Player will give you the guide on how to reroll this game.
You can reroll in Memento Mori by resetting your game data from the settings. This will only be available after you have completed the tutorial. Make sure you play without signing in. Here are the steps to reroll:
Now, you will have to play the tutorial again, until you get to invoke characters. You have to redo the whole process each time you plan to re-roll.