Stopping gutkha just for 7 to 8 months doesn't decrease risk of tobacco completely. It takes around 20 years abstinance from tobacco to completely get rid of risk of cancer.
Here image looks like some submucosal fibrosis/leukoplakia
Consult an ENT / dental surgeon for steroid injections in to the whitish parts of tongue
Health Tips
If it starts to grow further with bleeding or ulceration, go for biopsy to rule out cancer
But its Not required as of now