Need suggestions

3 years ago I gave my slice account to my friend and he missed 8 emi out of 23 installments( he missed continue 3 months) and my score was 641 and he was left 800 rupees unpaid, I cleared that amount and I applied for new personal 5k loan and I paid 1st installment now my score is 751 ( spike of 110 points ) now I am scared will it drop? And please help me with this to get 800+ and tell me how I can increase my score cause I am applying for huge business loan.
 
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