The macro "Fishing LMB MK2" for "GTA 5 RP" can be downloaded and used on any mouse and keyboard. Installing the macro is very easy in the Keyran program and increases your skill level in GTA 5 RP, if you follow the instructions!
Assign a comfortable key for you to activate the macro. When biting a fish, just press this key, and the macro will automatically hold the LMB (left mouse button). Now you can focus on fishing and not worry about constantly pressing the button.