Immersive Soundscapes is a datapack created for Minecraft 1.15 and above that adds a ton of athmospheric sounds to fulfill the silence that it's Minecraft gameplay. It aims to improve your sound experience without causing any visible lag, being easy to install and compatible.
INSTALLATION:
1. Download the latest version;
2. Drop "immersive-soundscapes-datapack.zip" inside your ".minecraft/saves/<world>/datapacks" folder; (how to open .minecraft folder)
3. Launch Minecraft;
4. Load the Resource Pack (how to load a resource pack)
5. Join the world. With cheats on, type /reload to install the datapack.