Sources to have your site judged? Can’t seem to figure why no sales

Hello everyone, I’ve recently started a new store and I’ve been running ads (probably $150 worth) and haven’t seen any sales.

I’ve done quite a bit of reading for what this could mean and I’ve come to the conclusion that my store must look untrustworthy in some way.

Im asking if anyone knows of any services where ecom experts could judge your site to let you know where it’s obviously failing.