Start Vosk on boot on Raspberry

hello, congratulations for the great and perfect work on vosk, I created a script that works fine from shell on raspberry, starting it with the python3 script.py command. The big problem is that I want to start this script when the raspberry is turned on, so I did the whole procedure on crontab, but every time it tells me that it does not find the modules precisely it says
`file.py, line1, in from vosk import Model, KaldiRecognizer ModuleNotFoundError: no module named 'vosk'`
my impression is that when I start the script from shell myself manually, the vosk libraries are loaded well, if it starts automatically from crontab the libraries are not recognized, but I don't know how to do it, please help me, thanks