Advice Needed How to increase the sells of my shop?

Always try to solve a problem. Best way to acquire customers

Id say find some discord groups related to that and sell, build up rep, maybe pay a youtuber a little for advertising or something.

SEO, SEO SEO. Get yourself Indexable and build networks via Social networks etc. The more audiences you reach out to the faster you optimize on search engines. It may seem a daunting task but I'm a business consultant that has helped over 50 businesses last year achieved Profit with EBITDA's showing growth and profit. Not advertising myself here but just letting you know. There are tonnes of ways to make your business succeed but ultimately you need to spread the word.

Ultimately, DON'T give up!