Launch a SaaS MVP in 90 Days as a Solo Founder

Scope creep. Adding 'nice-to-have' features instead of sticking strictly to the MVP.

Strictly evaluate every new feature idea against the question: 'Is this required to get the first paying user?' If no, log it in a backlog and ignore it for now.

Burnout from balancing a full-time job with <20 hours/week of intense development.

Protect your sleep, take at least one full day off per week from the project, and rely heavily on the boilerplate to save time.

Building a great product but having no one to sell it to because marketing was neglected until the end.

Commit to the recurring 'Build in Public' and outreach steps from day one. Do not wait until the code is finished to start talking about it.