Mortgage Interest deduction for loan over 750K

Hi

 

I am asking this question after searching the community and not finding a satisfactory answer.

 

My situation is as follows:

1. Home mortgage of over $1 Million taken in 2021 at 3%

2. Property and school taxes for the year 2022 were $20k

 

My query is as follows

1. Mortgage interest publication says that the interest paid on the  first $750k is deductible. 

    How do I calculate the interest deductible since my balance is over $1 Million

2. Turbo Tax last year asked me to take a standard deduction last year, however I feel that it must be a mistake and maybe I will benefit from higher deductions if I did itemized deductions ?

 

Please advise on what is the correct way to handle this