@Qiannnss hi author! I'm doing fine. I hope you are also?
And in my opinion, book 2 sound great but i also hope you finish your first book with a good ending or cliff hanger? And it's never matter if your wants to write a long story UNTIL the storyline is good.
If want to take a bit longer and finish your story fully, then it’s fine, it's good.
But if you want write shot and end the story with good ending or whatever you want, then start with book 2... It's also a good idea!!
As for me, i love to read book 2 of handlebars. But all depends on you. And your story going sooo well, so don’t worry ok?
Do whatever you want, no pressure!
Good luck!