Probably either creating stems from karaoke multitracks (e.g. [0]) or using Spleeter [1] 5-stem mode
https://github.com/intel/openvino-plugins-ai-audacity/blob/m...
Works pretty well for my personal/hobbyist use (quality also depends on genre and instruments used - synth stuff tends to bleed into voice a bit).
If I recall correctly, https://vocalremover.org/ worked pretty well. Though, it's pretty limited in the free tier and only allows payment via patreon. I never tried the paid version because I don't have a patreon account and don't want one.