Seen from a global perspective, there are quite a lot of Japanese people who visit art museums or go to art galleries.
Seen from a global perspective, there are really quite a lot of people in Japan who visit art museums and galleries.
ご質問どうもありがとうございます。
様々な表現があると思いますが、いくつ自然な表現を紹介します。
1. Seen from a global perspective, there are quite a lot of Japanese people who visit art museums or go to art galleries.
2. Seen from a global perspective, there are really quite a lot of people in Japan who visit art museums and galleries.
quite a lot of = 結構多い
お好みに合わせて使い分けてみてください。
ご参考にしていただければ幸いです。
ドイツ 
