Salary Help: How to negotiate for higher salary

Hey, I am earning 7 lakh per annum after 5 YOY. I have an offer letter of 11 lpa. I know I can be offered packages up to 14 lpa in a couple of weeks. I am underpaid in my current company.

However, I don't want to make a switch right now. I am very sure about it. The job is pretty good. My manager is a kind and learned man, I am learning quite a lot. Plus the job is not hectic and it is allowing me moonlighting (secretly). I earn around 1 lakh per month through moonlighting.

How should I request/urge/encourage my company to offer me a hike of 25% to 30%. The company will most likely offer me a hike of 10% to 15%.

I will make a switch after 6 months (2 years of experience with this company). There is quite a lot of instability on my CV. My main idea is to be here till 2 years and increase my base here to 9 lpa.

I am a good or maybe exceptional performer. My performance was rated 4.50/5

Please help!

Problem statement: How to negotiate.