If you made it this far, you can continue to do this.
You've accomplished so much already, you can definitely keep it up.
ご質問ありがとうございます。
① "If you made it this far,"=「ここまで出来たのであれば」
"you can continue to do this."=「これを続けることは君には出来るよ。」
② "You've accomplished so much already,"=「既に君はいっぱい達成してきた」
"you can definitely keep it up."=「これからも絶対続けられるよ。」
ご参考に。
If you've been able to work hard up to now, I think you can keep going.
この場合、次のような言い方ができますよ。
ーIf you've been able to work hard up to now, I think you can keep going.
「これまで頑張ってこれたんだから、これからもできるよ」
to work hard で「頑張る・一生懸命取り組む」
ご参考まで!