The quick answer is that it is not easy and if this is important to you, you want to spend a few hundred dollars on a specialised commercial deverb plugin. Use your favourite search engine to find plugins you can try out.
If you want to try it in Audacity you can look at using centre isolation Karaoke, Rotation, Panning & more (note that Audacity’s Vocal Reduction and Isolation effect includes centre isolation) or try Noise Reduction (using a small area of reverb only as the Noise Profile).
Do not expect miracles.
Gale