What can we do to help reduce e-waste?

Join the fight for the right to repair. Manufacturers (I'm looking at you, Apple) have been removing the ability of end users to repair their own stuff and making it more difficult for independent repair shops to do their jobs. Repairing stuff goes a long way in keeping electronics out of land fills.

But repairing can be understood as "reusing", but there's a first step before reusing, it's reducing. Basically, stop buying shit that you don't need. If you don't buy it, it won't be manufactured, so it won't end up as e-waste.

If people minded more the reduce and reuse, recycling wouldn't be as needed.

Reintroducing removable cell phone batteries is a big start, and ending this shitty culture around buying a new phone every 2 years that is functionally identical to your existing phone.