Jacob Cass has some ideas. Check out his ballpark ranges below - are you undercharging?
https://justcreative.com/logo-design-cost/
Budget Logo Design Price List:
DIY / Logo makers: $0 – $50
Logo template: $5 – $100
Logo Contests / Crowdsourcing: $50 – $500
Mid-Range Logo Design Costs:
Offshore Designer: $100 – $250
Beginner Freelancer: $100 – $1000
Experienced Freelancer: $1000 – $5,000
Renowned Freelancer: $5000 – $15,000
Small Design Studio: $5000 – $30,000
Mid-Sized Agency: $5000 – $50,000+
High-End Logo Design Pricing:
Branding Agency: $50,000 – $100,000 (generally includes strategy & global brand identity)
Renowned Branding Agency: $100,000 – $1,000,000 + (generally includes strategy & global brand identity)
World Famous Designer: $100,000 – $1,000,000+