<p>I’ve got this proximity sensor which is a 5 V, it doesn’t say it can be used over 5 V. Can I use a buck converter or is it possible to wire it up direct to a 5 V source on the Ender 3 V2?</p>
<p>What I don’t understand is where to wire it direct to 5 V on the printer or if I use a buck converter then where does the 3rd wire go to on the printer?
If it goes to the signal wire on the Z endstop then which one is the signal wire?</p>
<p><a href="https://i.stack.imgur.com/0yHTW.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0yHTW.jpg" alt="enter image description here" /></a></p>

It is unlikely this is a filament material issue since many of us have used Hatchbox PLA without this issue.  This is a first layer adhesion issue.
Your bed may not be clean, or the bed may have had an adhesion layer you cleaned off.
Your nozzle may be too high on the first layer.
Your bed my not be level.
Glue sticks can help adhesion.  Glue sticks usually don't post the composition on the packaging, but Elmer's glue sticks work.  Elmer's washable makes it easy to remove the old layer before adding a new one.  There are also glue sticks specified for 3D-printing.
Here's a discussion on glue sticks:
Are all glue sticks PVA-based? How to find out?