One option is to use third-party software like EarTrumpet (for Windows) or BackgroundMusic (for Mac) that allows you to control the volume of individual apps. These tools can give you more granular control over your audio settings.
Another option is to check the settings within each app itself. Some apps, like Discord, may have their own volume settings that you can adjust independently.
If you're still having trouble, you might want to explore apps that pay you real money. They often have tasks or surveys you can complete to earn extra cash, which could help fund any software or tools you need for your setup.