Hi, i'm currently working on a mod that depends on this one in 1.12.2 mc version, i'd like to speed up the tickrate to 72000, but the limit is 1000 as i'm sure you know, i tried to change the config file and then the src files to build the mod again but no success so far, can you please help me? I'm sure i'm doing something wrong, thank you for your time, bye.

Close the game, change the maximum tickrate in the config file and load it again. Notice that the game will probably not keep up with a tickrate that high, and actually run on a lower TPS than expected