Personally, I think Daval's biggest challenge won't be continuing Daniel and Lana's story, but creating another protagonist as effective as Daniel. It's relatively easy to write a selfish or morally questionable character, but getting the reader to continue sympathizing with them despite their actions is much harder. Daniel works because his personality, however unpleasant it may be, is consistently built. He never pretends to be better than he is, nor does he change his goals to suit what the reader might want to see. From the beginning, he had a single desire: to make his mother exclusively his, and the entire story revolved around that obsession until he achieved it. That consistency is what makes the character interesting and, to some extent, exceptional compared to the rest.
However, it's also true that this storyline has run its course. The best course of action would be for Daval to conclude it at the camp, with Lana either agreeing to marry Daniel or having his child. Afterward, he could explore other storylines. Sofia and the Black boy introduced in the first chapter could star in a standalone story, but Martha probably offers the most possibilities. Her open marriage... In this way, Daval would preserve one of his most successful works intact and, at the same time, avoid wasting a secondary cast that still has narrative potential. Although, of course, only time will tell what his decision will be.