Do you have a specialization?
The more specialized you are the easier it is to charge more and stand out to the target group.
If you don’t, you could just choose the project from the past for years that was the easiest to do that also made the most money and focus on getting a few more of those.
The concept is that a generalist video studio might charge say $1000 for a video production package but a boutique video studio specialized in sales training videos for pharma companies, for example, might charge ten times that or more.
The key is making sure the niche exists.