when I was building my own side projects my biggest bottleneck was everything around the product.

   - polished landing page
   - SEO
   - marketing and branding materials
   - setting up social accounts: Twitter, Facebook, Reddit, LinkedIn 
   - preparing basic CI/CD to be able to quickly deploy changes
   - setting up ads across many ad services like Google, Facebook and etc,.
   - setting up CNAMEs, records for email deliverability

My hurdle on my startup is marketing.

I know for sure my threatfeed is high quality and worth the subscription. I know it functions; it's a working project to be sure.

Gumroad does all my payment processing and taxation stuff for me.

But i've gotten 100 views in a month and 0 customers :(

http://mapleintel.ca

Usually the problem is when collaborating with other people, it's hard to give them access to stuff and track what they can access, to make sure collaboration works ok (e.g. many tools don't support 2 people editing the same content with conflict resolution).