70K is total visitors number or new users number? Some of users will be old users, some of them will visit your web site from other platforms and may be google not be cached them. If this number for new users there will be an issue but if total visitors number it is not bad but not perfect. Also how many days do you track them 7, 15, 30 or 540? For example if your tracking date 15 days, a visistor who visit your web site 15 days later will be deleted from the list and when they visit again it will be new visitor for list but not it will be deleted
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