How Can I Get Normal Liver AST Values ?

hi im a 56 year old im 51 weigh 169 now was 172 but few months ago went to dr and my numbers were high for liver ast 146 today did unlsound and sent me to spelisist which he told me to lose some weight see if numbers go down did a emune blood work what can i do to lose weight ive been walking every day for 4 5 miles ive cut back onn breads and sweets just drink water once in a while 1 hi im a 56 year old lady i take blood pressue meds 25 mg. but a few months aago went to dr. for check up yearly had high numbers for liver , so had a sogram done show fatty liver was sent to specilist he looked at numbers and sogram said he though try to lose weight and go on diet watch calorie intake which i been doing ive been walking every day 4-5 miles eating better but still not losing but a few lbs. i was 172first visit to dr. in end of feb this morning was 169 had liver blood work again last week and my numbers are ast 146 , what can i do to get this weight off and get my numbers down . the speclist said may do a biposey when i go back in sept if my numbers dont go down , but the results from my reg. dr, blood work last week still show high 146 ,what are normal numbers , i will be carry these results to my speclist in sept , put dont know what to do no ins. for biposey and husband not working , but cant get ins, say we have to many bills plus have three cars but just owe on one , but what can i do to help with my high numbers