My family have retailed for generations. I studied business at uni, and took a 6 year graduate course at a top flight retailer in the 90s. I also have an accountancy qualification, and was on the board of the British Shops and Stores association for years. I kept my retail knowledge up to date, embraced change and did all I could to learn about and understand retail.
I don't blow my trumpet often but I honestly do know and love retail.
After 44 years trading we closed our previously lucrative independent family business early this year. For the first time ever there was so much conspiring against us that I felt it best to close whilst we could still afford to pay redundancy to our lovely team.
The main issues were: crippling rent; council making changes to parking (we had a small car park but it wasn't enough and people used it who weren't in our store which is v hard to police thanks to clamping rules); Road congestion; suppliers increasing minimums and changing payment terms; theft; Amazon etc.; lack of footfall on high street; online stores selling our product slightly cheaper (so people came to us for advice and to look at and feel our merchandise but bought it from a cheaper online seller with less overheads)- I could go on if it helps!
OP, it is incredibly tough out there. It's also really easy to get caught up in what is ostensibly a brilliant idea which you are passionate about- but which won't work in reality.
I'd say your idea sounds super- but in reality in most areas it wont appeal to enough people. The true number of people who really care about reducing waste, who don't mind paying over the odds, who have time and inclination to visit a separate store for certain goods, who will overlook PITA parking- are depressingly low. Many people do seem to care about waste but are too time and cash poor to act by using a store such as yours.
You would likely see a surge of interest as may beautiful new stores do, but this then dwindles.
Retail is relentless- long opening hours, weekend trading, bank holiday opening for a start. I appreciate you feel unfulfilled but honestly I'd consider keeping your fantastically paid part time job and doing some volunteering in something that you feel passionate about.
I'm sorry to be all doom and gloom but I felt I had to give my POV.