Hello! I'm on day 16 now of the level 1 course with Jonathan Estabrooks, and I've been writing down all of the exercises he's shown and I practice them every day. The problem now, is that it takes me SUUPER LONG to finish all the exercises, since there are so many of them lol. How should I be handling this? Should I continue to do every single exercise, or should I cut out some of them, and if so, how do I know which ones to cut out? Thank you!

I'd recommend doing the previous 5 days' exercises, so you're dropping one older exercise per day! You can also consider choosing the exercises you find particularly helpful, or tailoring your warmup/exercise to the type of song you're about to sing. See below for more advice:

One lesson per day? How to practice for the best results: https://www.30daysinger.com/blog/one-lesson-per-day-how-to-practice-for-the-best-results

Building a daily routine: https://www.youtube.com/watch?v=gwzvDGmHJvQ