YOU SAID:
I have been trying to reach you since long time
INTO JAPANESE
私は長い間あなたに連絡しようとしてきました
BACK INTO ENGLISH
I have been trying to contact you for a long time
INTO JAPANESE
私は長い間あなたに連絡しようとしてきました
BACK INTO ENGLISH
I have been trying to contact you for a long time
That didn't even make that much sense in English.