I'm admittedly not the director, I voice Seifer and Kiros and do a bit of audio work/QC/promoting. Our co-directors were having similar difficulty in the beginning finding people who wanted to do it. They had been advertising mainly on Youtube, DeviantArt and their own warm networks and weren't getting much response. I suggested using a fandub casting call website like behindthevoiceactors.com or castingcall.club . They did, and got a lot more hits.