Extremely oily scalp, high DHT. How can I fix it?

I had started losing hair since my teens and got bald at the age of 25 so had a hair transplant in 2016 and which was a good decision. I am using minoxidil and finestride since 2017 so reduce hairfall but my scalp remains very oily. i wash my hair every day in the morning but it gets visibly oily in 5-6 hours and i have to wash them again i heard that is due to high dht level but how can i fix it? it also causes hair fall of the remaining hair.