We will have to ban single-use plastics (and plastics being used unnecessarily), planned obsolescence as a concept for product development, non-repairable/disposable electronics/products, etc. to really make a dent on landfill usage. But as you say, it's hard to get around landfills completely when capitalism is this out of control.

We need to produce products that can actually be recycled (without the use of toxic chemicals or PFAs), produce more products locally vs. shipping them across the world (using glass to replace most plastic use). We likely need to reinvent garbage collection (what's acceptable to throw out), a revolution in recycling and product design, education campaigns on recycling and proper garbage disposal, and DIY movements to restore older electronics to their glory using open and free solutions.