It all depends on your chest bone ladies- mine I know is quite wide and therefore I have a gap between my boobs naturally. Of course I have a much better cleavage at the minute than I did 2 weeks ago but I know they will never be ‘perfect’ (whatever that word means lol).
If they were wide apart before they will be after I’m afraid. You can only use extreme cleavage and push up bras to enhance a cleavage. I’m sure wonderbra do a bra where you can really pull in the middle with some kind of toggle- may be worth looking at x