A list of buyers (from ANY source) is only as valuable as its FIT between the market and the product. This includes criteria such as:
-WHAT they bought
-WHY they bought it (what WANT it fulfilled)
-HOW LONG AGO they bought it
-HOW MUCH they spent
-etc.

Regarding your past buyer list:
Start by considering how you are going to market your new business. What is your message? What is your offer? What is your USP? What WANT does it fulfill?

Then try to find a connection between your new product's market and your previous product's market.

For example - Do people who buy brand footwear and clothing ALSO drink coffee? And might that specific market be interested in a coffee subscription?

Or perhaps the previous buyers know YOU and love buying from you? In which case you might be able to leverage your relationship with them in your marketing.

If you CAN find a connection (aka a reason to market your new product to your old buyers) then build your marketing to them around that reason.

If you can NOT find a reason why - be prepared for any marketing to that list to fail.

This is not to say that marketing to them without a reason will definitely fail... that's not something we can predict.

However I would strongly suggest that you concentrate on high probability marketing efforts such as an email that communicates a message and an offer to a list of targeted buyers.

Message me if you'd like to explore this and other ideas for marketing and business growth.

In any case - I wish you massive success in your new venture!

Cheers,
David