Need help running games on Linux (Debian 12, RTX 2050, Steam/Heroic)

Hey everyone, I'm having a hard time getting games to run properly on my PC with Linux. Here's my setup:

• OS: Debian 12
• GPU: NVIDIA GeForce RTX 2050 (dedicated)
• Drivers: Latest proprietary drivers installed
• Platforms: Steam and Heroic Games Launcher

Most Windows games either:

• show a black screen and crash,
• or display messages like "DX12 is not supported" or "D3D11-compatible GPU required".

I've tried:

• Setting the correct GPU using environment variables (e.g., DXVK_FILTER_DEVICE),
• Using different Proton versions (including GE-Proton),
• Installing dependencies like Vulkan and Wine,
• Setting launch options on Steam and Heroic.

Some games work when forcing the GPU manually, but most still won't launch or crash after opening.

Has anyone with a similar setup made it work? Any help or suggestions would be really appreciated!