How can I make my AirPods sit better?

Re: Having difficulty seating my earpieces.

We are all unique, so finding the right fit to suit is important.

Apple support have articles online (links below) that may be helpful:

Ear Tips

Eg: Your AirPods Pro (2nd generation) come with four sizes of ear tips.

Your AirPods Pro (1st generation) come with three sizes of ear tips.

Choose your AirPods Pro ear tips and use the Ear Tip Fit Test - Apple Support

More info: Wearing your AirPods, EarPods, or Beats devices - Apple Support

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"I’m having trouble ..... volume when they’re in."

You might want to check the volume level on the AirPods themselves:

Pause, skip, and adjust volume with your AirPods and AirPods Pro - Apple Support

Headphone Accommodations works with AirPods Pro:

How to: Customize headphone audio levels on your iPhone or iPad - Apple Support

To monitor and limit the volume of AirPods

Check your headphone audio levels on iPhone - Apple Support

Volume of sound effects: Adjust the volume of sound effects for AirPods - Apple Support

How to check / change the microphone settings / left / right:

Change settings for AirPods Pro 1 and 2 - Apple Support

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More info. if needed:

Resource: AirPods User Guide - Apple Support

Find all the topics, resources, and contact options you need for your AirPods....

AirPods Support Website: AirPods Support - Official Apple Support

All the best :-)