If you have a Starter, Pro, or Enterprise seat you can change the URL.
The trick is to change it to something nodody else has used - if someone is using "ashley-martin" it won't save. You may have to use an initial or append a company name.
I use things like "mike-eastwood-zoom" so it's easy for me to see which is which.
Here to learn more about HubSpot and share my HubSpot Knowledge. I'm the founder of Webalite a HubSpot Partner Agency based in Wellington, New Zealand and the founder of Portal-iQ the world's first automated HubSpot Portal Audit that helps you work smarter with HubSpot.