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That is our next step. We discussed it this morning after your original post. Thank you.

Honestly, we've never had any.

In the case that I do not have access to the htaccess file, is there anything else that I can do? Or, is there anything else that I could do regardless?

According to Big Commerce? Yes, old URL's will 301 redirect to new URL's automatically when you edit them. However, when we first started updating our products, we found that a lot of product URL's didn't redirect. Instead it gave us a 404 page.

I believe our old, previous store has been taken down by Homestead. I can't find any of our old organic results for that store to give you an example.

First of all, the URL is stores.dhsequipment.com.

In January, this online store switched from Homestead to Big Commerce. Since the store updated, we decided now is the time to update our product descriptions, URL's, title tags and meta descriptions. (For the first time, we had the ability to customize our URL's.)

Product Description: I went through 2,500 products and updated the product description. I added an H1 & H2 to each description, and included pertinent information such as part numbers. Each product also received a new page title, meta description (which is usually the first line of the product description, don't know if this is bad or not) and a new URL, (which did redirect).

Once I would complete a section, I would submit a new sitemap to Webmaster Tools.

After a month and nothing happening, I started using SEOMoz which helped me rebuild some of my more important pages, such as the home page and main category pages such as:

http://stores.dhsequipmentparts.com/stihl-ts420-parts/
http://stores.dhsequipmentparts.com/stihl-ts700-parts-stihl-ts800-parts/

I fetched these pages in Webmaster Tools after completion. However, it's been several weeks since and I'm still on page 4 or 5 in the SERPs.

Just a little history on the store; this store has been in operation for more than 6 years. Previously, we ranked on page one for 75%+ of our products. My belief is because our URL's had history, probably more so than our competitors.

I'm not sure what I should do. Business is super slow and we can't afford to wait much longer.