How to get up to eight and a half turns,
https://www.youtube.com/watch?v=OaRFgXzupFA, using Arduino or other microprocessor.
If you are using it for a sail boat, and you only need a moderate increase in sail sheet travel, consider using a larger drum.
For example, a 4cm diameter drum will wind approx. 12.5 cm of line per full rotation, a 5cm diameter drum would wind almost 20cm per rotation, and a 6cm drum would wind 28cm. However, the larger the drum, the more torque needed.