I don't see any reason why you would wait at all for a page level tweak which you believed was likely to be beneficial. (Well, I do, but it isn't relevant to your situation.)
You're not obsessively tweaking the same elements over and over again, right? That would not be strategically wise. Instead, make a best guess now, then move onto strategic issues like "How do I get links to my website? How do I get links to my website at scale?"
In general, it is very, very, very difficult to map specific on-page micro-optimizations to business-level successes. (There are times when this is not the case, but a) you'll generally have had a older website b) you were doing something extremely wrong, like not having title tags for every item in a 200k page catalog and c) you will see almost immediate, dramatic results.)
You're not obsessively tweaking the same elements over and over again, right? That would not be strategically wise. Instead, make a best guess now, then move onto strategic issues like "How do I get links to my website? How do I get links to my website at scale?"
In general, it is very, very, very difficult to map specific on-page micro-optimizations to business-level successes. (There are times when this is not the case, but a) you'll generally have had a older website b) you were doing something extremely wrong, like not having title tags for every item in a 200k page catalog and c) you will see almost immediate, dramatic results.)