Hi,
I'm Dyari. Thanks for reaching out.
In addition to the audio troubleshooting already provided, disable all recording and overlay features, including AMD Radeon Overlay, Instant Replay and Record Desktop, Discord Overlay, Xbox Game Bar and background recording, Steam Overlay. Restart the computer and test Valorant.
Restore the AMD graphics settings to their defaults. Temporarily remove any CPU or GPU overclock or undervolt as well. Installing the latest graphics card driver will help as well.
Please feel free to ask if you need further assistance and keep me updated.