How to achieve continious rotation in stepper motor

Projects General Guidance
2

You need to post a link to the datasheet for your stepper motor. An L298 may bot be a suitable driver.

You also need to tell us what motor power supply you have - volts and amps.

And you need to post your program

...R
Stepper Motor Basics
Simple Stepper Code

also look up the AccelStepper library