Du kannst dreimal so viele Kunden schaffen wie bislang.
I don't know how to put this, but I understand that there exist two different "schaffen" verbs with identical spelling, one using the past participle "geschaffen" while the other using "geschafft".
I wonder which of the two "schaffen"s this is?
... create/make three times as many customers ... [the one with "geschaffen"]
or: ... manage three times as many customers ... [the one with "geschafft"]