Presuming Season 3 covers the entirety of the Curse of Darkness storyline and ends the Trevor Belmont era, I wonder how the studio is planning on doing the future seasons (if they get renewed for them). As I can't imagine them adapting every single canonical Belmont/game protagonist, since that would likely be far too many seasons the studio can reliably bet on for renewal, plus the repetitiveness of many of the games storylines doesn't lend itself to serial storytelling (it would especially reduce the significance of Dracula's death, if he keeps on being resurrected again and again).
I think the best route narrative-wise for future seasons, would be to adapt the Richter Belmont era and Soma Cruz era games with Alucard acting and the connecting thread character for a good thematic narrative trilogy of Belmont eras.