Listen for ticks. Ticks and no Gjall sound mean 100% Soft Tissue nearby. Ticks only spawn naturally (Before the Queen is slain) at soft tissue deposits.

The mistlands is, like every other biome, designed to teach you a lesson. The lesson of the Mistlands is that you can't always rely on your eyes. Every mob makes a very distinct sound, audible from very far away. You can use this for navigation in conjunction with other lessons you have picked up in Valheim.

Hear Seeker chirps (2-3 clealry audible) but it's daytime? There's a high chance there's an infested mines nearby.

Hear Multiple Dvergr, there's gonna be a tower or excavation nearby.

Ticks but no Gjall sounds? Likely Soft Tissue deposit.

More advanced than this though:

GJall and Seekers make distinct audio noises when Idle and Aggro, you can actual determine their state by their noises. Both also have (like many mobs) a sound cue for their "Windup" before attack, which you can use to blind parry or dodge.