There are a lot of tools that can reduce vertices of meshes, here are some:
- [FREE/PAID]http://www.mesh-online.net/ : It has a free editor tool where it uploads your mesh to their online webservice and reduces it automatically. It works quite good, but I've never tried it with a mesh that has 30m vertices. It may take a while to upload a mesh with 30m vertices, you can try it.
- [FREE]https://github.com/Whinarn/UnityMeshSimplifier if the previous one doesn't work out for you, you can try this one.
- [PAID]https://assetstore.unity.com/packages/tools/modeling/mesh-simplify-43658 another tool that serves your needs.
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