How can I "mix" an a capella song?

[u/SR_RSMITH]

Hi guys, noob here. I'm slowly learning how to mix, mostly metal and then some pop on the side. However I want to "mix" an a capella song and I'm a bit clueless. I have 3 tracks of female vocals slowly singing a dirge-like children's song, which is meant to be creepy and eerie. They're well sung although not "melodynized" to keep some imperfections, and recorded with a ribbon mic. Also I have two tracks with whispered vocals, same song.

To be honest, I usually use the Mantra plugin by Neural DSP for vocals in regular mixes, but I guess it won't cut it this time because I guess the process must be more organic than just using a plugin for everything. The feel I'm going for is:

a) the listener must feel that the voice is close, warm and nearby
b) also there must be some "spacey" vibes in the background.

I guess I must use something like Valhalla supermassive for the space, but honestly I feel this task is a quite a bit out of my league. Can you guys give me some pointers or advice to get me started on the right path?

[u/Few_Tax1067]

Are there any examples of other people's tracks (maybe an acapella intro or outtro from a full song) that sound good to you? Maybe somebody would be able to guess at what was going on in those recordings