Hi! I know there's plenty of different techniques to reduce that, but I haven't used them before. I usually just pick the most neutral looking texture for the base of a terrain, and then paint the other textures on it by hand.

But here's what I found about this online:

1. Texture Variation

Multiple grass textures: Blend 2–4 variations of grass textures instead of just one.

Texture clusters: Use texture atlases or arrays with slightly different tones/patterns, and randomly assign them per patch.

Random rotation/scale: Randomly rotate and slightly scale the UVs of grass patches so patterns don’t align.

2. Shader-Based Tricks

Texture blending (splat mapping): Blend grass with dirt, flowers, or dry patches using noise or terrain masks.

Triplanar mapping: Helps remove stretching on slopes and hides directional repetition.

Detail textures: Use a small, high-frequency detail map overlayed on top of the main grass texture.

World-space noise modulation: Add a subtle noise mask in the shader to shift UVs, tint, or blend textures per world position.

3. Mesh & Placement Variation

Procedural scattering: Random placement of small grass clumps, rocks, or flowers breaks monotony.

Different models: Mix a few different grass clump meshes. Even 3–4 variants go a long way.

Clumping & empty patches: Don’t make everything perfectly even; leave gaps or denser clusters.

4. Color & Lighting Variation

Vertex color variation: Slight per-instance color shifts (tinting green/yellow) so each patch looks unique.

Gradient maps: Apply world-space gradients (like slightly different hues near water or higher elevations).

Dynamic lighting/shadows: Grass looks less repetitive when lit with varied light/shadow patterns.

5. Advanced Techniques

Megatextures / Virtual Texturing (e.g. id Tech): Huge unique textures reduce tiling, but memory heavy.

Procedural generation: Noise functions (Perlin, Worley, etc.) to generate texture masks or distribution maps.

Decals & overlays: Dirt, mud tracks, leaves, moss scattered on top of the terrain.