I would consider the templates not as projects since they are, well, templates. 🙂
I am also not so sure about the ongoing projects. I have some recurring tasks, like writing the quote of the day in our company chat and I handle these via recurring actions. (Things is creating a task every weekday, which I can check off then.)
I, too, have somewhat 30 projects which could be started but every project added to my active projects would distract me a little bit more so I actively decided not to search for a new insurance now but to wait until I have done one or more of my other projects.
During my weekly review I can than decide that I will promote one or more of my someday projects to active projects.