How to increase raw materials cities skylines?

🏗 Increasing Raw Materials in Cities: Skylines

1. Build more industrial zones, especially generic industry or specialized raw materials industry.
2. Connect zones with efficient road and cargo networks to reduce transport time.
3. Upgrade cargo hubs, harbors, or train cargo terminals to increase import/export efficiency.
4. Use mods like Traffic Manager to optimize flow and reduce bottlenecks.

Tip: Keep demand for goods high, otherwise industries stop producing.
More info: Cities Skylines Wiki