There's really no way to actually get a lgf except through grace of happenstance. You should have sealed the deal while you had the chance.
>how do i talk to 9-12 girls
If you mean "how do i find girls to talk to", you don't. it just happens or it doesn't, any active attempt on your part to get closer to children is just going to make people suspicious of you and close you out.
If you mean "how do i talk to girls" in the literal sense, you talk to them like you would any other woman, mixing politeness with a dash of playfulness. Don't act condescending, and don't mentally lower yourself to their age; they're looking for maturity without the judgement that adults usually bring with them, they don't want you trying to act like their dad, but they don't want you to act like a manchild either.