Alternate approach--do you have good monitoring in place?
Also, is the issue that the audience can't hear you, or that you can't hear yourself?
If the former, then your sound person (if you have one) and the band need to work together to strategize. Poor live sound is like Amazon crushing your package during delivery by throwing it at your door. It's a waste of your band's efforts and is disappointing to your audience.
If it's the latter, it's a monitoring issue, and boosting the volume is only going to make it worse for the bassist.
Vocalists and unfretted string instruments have the biggest challenge hearing themselves and, as a result, keeping in tune on stage, because they're quieter, and because intonation is inherently manual. And for double bass, this is the most challenging, because double bass is quiet, and because low frequencies flood the monitors, adding a lot to stage volume and creating feedback issues.
However, in ear monitor technology has gotten considerably cheaper in the last few years, and bassists should be one of the first band members to adopt IEMs. You can buy IEMs for $20-50 online, and get a line out from the mixer. Digital mixers are affordable these days, and allow custom monitor mixes.
Philosophically, it might feel like overkill, especially if your band is playing unreinforced. But if they are playing piano, drums, horns, these are naturally pretty loud and come with built in auto tune. And I doubt a guitarist or singer would join them without amps or monitors, so why would a bassist, unless the stage acoustics are perfect?
In a less than ideal acoustic environment, or any setting where the bass is going to be amplified or monitored on stage, IEMs are the best choice. They help bring stage volume way down, and are the only real way to get a beefy but clear tone to you, which gives you much more confidence when playing live.
PS, on bigger gigs, the sound person will love you for having IEMs, because of how much easier you're making their job.