ここから先は

from here on; beyond this point

→ 此処
phrase Rare #37,014
from here on; beyond this point Used to mark a boundary in space, time, or a situation. It can mean that something applies starting now or that an area beyond a point is different or inaccessible.
JA: ここから先は関係者以外立入禁止です。
EN: Beyond this point, no unauthorized persons are allowed.

ここから先はあの

From here on out is the afterlife.

— 君の名は。 (2016)

ここから先は私の知らない土地です

From here on, it's unfamiliar territory to me.

— ロード・オブ・ザ・リング (2001)

一葉ここから先はカクリヨ四葉

(Ichiyo) From here on is Kakuriyo. (Yotsuba) Huh?

— 君の名は。 (2016)

ここから先は入れません

You can't go any farther from here.

— 甘い生活 (1960)