how can reduce albumin

You have to treat underlying causes like UTI, high blood pressure, diabetes

Albumin in urine is a possible indication of urinary tract infection (UTI) or of kidney impairment from chronic hypertension or diabetes. If it is related to diabetes or hypertension you have to keep blood sugar and blood pressure under control.
If you have urinary tract infection, here are few tips:
-Drink plenty of water and juices such as cranberry juice which is one of the best home remedies to combat against urinary tract infection.
-Urinate frequently which will help prevent bladder irritation.
-Have tender coconut water daily for few weeks.