For serialized webnovels, it's highly recommended to keep books under one title (unless wattpad which only allows 200 chapters under 1 cover; Tapas doesnt have a limit). For example, all The Beginning After the End 12 seasons were under one cover with like, 1.5k episodes.
It's been an issue on webnovel platforms where readers mix them up unless it's clearly stated in the title, like "Book 2" or something. Many of the subs don't follow over to the separate books, too. I've seen Book 1 do really well with hundreds of thousands of views and 5k subs, for example, and only 800 subbed to Book 2. It's a risk to separate them compared to traditionally published novels which will have physical copies. (If you ever print your books, then separate them).
Plus, it's beneficial to keep your seasons, books, parts, etc under one title because you can keep it serialized for a long time which Tapas likes. More engagement for the same title! To separate seasons/sequels depends on your preference. I put [S1] in the chapter title to signify season 1. Then I put [Season 1 ending] at the end of the last chapter and [Season 2] at the beginning when book 2 starts. Others add an illustration and/or extra chapter exclaiming Book 2.