I need help hacking my JChere account

Hello. I am CobaltNeCo and I am studying hacking.

While studying hacking, I found a site that I want to hack.

I want to extract the DB from a shopping mall site called "日本转运&日本代购 - 雅虎拍卖、煤炉Mercari、乐天、日本亚马逊直送商品，并提供退税服务 | JChere".

I was able to obtain some account information and passwords, but it was not enough to call it an administrator account or DB.

I tried using splmap, nmap, etc., but I failed in the end.

I am writing this because I wonder if there is a separate way to hack this site and extract the DB.

If anyone knows how, please tell me.

My Telegram account is @chilse_1.

It is too difficult because I am studying alone. Please help me.

I can't pay a lot of money, but I will definitely repay the favor.