Reverb is oftentimes overlooked or misunderstood when it comes to mixing. It is usually added to produce a track with depth and width. Aside from that, it also pumps up a rather boring sound. The trick is knowing how much to use and how to adjust its various parameters.
There are four reasons why reverb has to be added. First is to make the recording sound like it’s in a specific acoustic environment. Next is to add some character and zest to a recorded sound. It is also added to make a track sound bigger or bolder than it actually is. Lastly, to move a track further back in the mix.
Read more about this here: https://bobbyowsinskiblog.com/2019/07/03/reverb-reasons/