So... Solo live is just to know what ranking you r compared to other player. This not gonna have you rewards or anything like that. I've read ot from enstar fandom page https://ensemble-stars.fandom.com/wiki/Unit_Collection_Event_Guide

ensemble-stars.fandom.com Unit Collection Event Guide | The English Ensemble Stars Wiki | FANDOM powered by Wikia Unit Collection events are a special kind of event that center on a single or couple unit(s) rather than having varied cards as point and ranking rewards. The cards able to be obtained during these events are based on illustrations from the anime. They begin as 3☆ and are able to be evolved up...