Recently, I oft've been going to a nearby jewelry shop because the store manager, a 32-year-old woman, is very friendly and willing to listen to me.

"Recently" and "often" sound a bit weird together. "Recently, I've been going" is more natural, but you can also say "Recently, I started going" if the shop is completely new to you, or "Recently, I've been going to a nearby jewelry shop more often" if you've been there before and it's only the frequency that has changed recently.

She became the head clerk two years ago, a rare position for someone ofor her age.

"for someone of her age" and even just "for someone her age" both work here, but "for someone for her age" does not.

However, according to her, the small shop is located atin a shopping mall and has a relatively young customer base, so the monthly total sales are not very high.

"according to her" would be fine here if you had just said "However, according to her, the shop has a relatively young customer base, so the monthly sales are not very high." but including factual information that you already know and are completely certain about like the location of the shop makes it not fit here.

Actually, most of the items for sale are reasonabley priced and there is not much variety.

To be honest, if I wanted to buy luxuriousy items like pearls, I would choose other high-end stores.

"luxurious items" is not wrong but "luxury items" might work a bit better here. The former refers more to your own subjective judgment of the items and the latter is the term you'll often see used in business and economics. It refers specifically to more high-quality and expensive items like pearls, expensive handbags, expensive watches, etc.

Then she enthusiastically replied, “Please come and buy something because the total sales and sales per employee will be made publicreported to the company.” I was dismayed, but quickly I said, “Ok, I will come but just to take a look.” She looked a little disappointed.

"made public" is usually used when something will be shared with the general public. If the sales numbers aren't being released to people outside the company, it would be better to say something like "will be reported to the company" or "will be shared with the company". If the sales numbers are being reported to people outside the company as well, you can just say "will be made public".

I realized then that we are just have a seller-customer relationship.

"That's when I realized that we just have a seller-customer relationship." would also be very natural here as well.

Recently, I oftenstarted to go to a nearby jewelry shop because the store manager, a 32-year-old woman, is very friendly and willing to listen to me.

She became the head clerk two years ago, a rare position for someone ofor her age.

However, according to her, the small shop is located atin a shopping mall and has a relatively young customer base, so the monthly total sales areis not very high.

"According to her" seems a bit off here. The store has an exact location, which is known, it cannot be "guessed" if she is working there.

Actually, most of the items for sale are reasonabley priced and there is not much variety.

Then she enthusiastically replied, “Please come and buy something because the total sales and sales per employee will be made public to the company.” I was dismayed, but quickly I said, “Ok, I will come but just to take a look.” She looked a little disappointed.