How do you say in English?
ご好評につき、○○再入荷致しました。
を英語でなんと言いますか？

Question

Answer

ご好評につき = due to high popularity, due to its popular reception, due to popular demand, etc. 
再入荷致しました = we have restocked the item

If you mention the item in the sentence:
"Due to popular demand, we have restocked [the item]!"
Ex. 
"Due to popular demand, we have restocked our Vintage 1986-Style Bomber Jackets (Black Only)!" 
"Due to popular demand, we have restocked the Cat-Pattern Wallet!"

If you don't mention the item and just want to use the sentence as a header or article title:
"Back by popular demand!"

ご自宅で快適に語学を学べるチャンスをお見逃しなく。経験豊富な語学講師陣の中からお選びいただき、今すぐ最初のレッスンにお申し込みください！