No problem! I think you are making the right move. Mautic 3x is light years ahead of 2x and 4x is right around the corner. I have a 4x beta instance with 50+ million contacts and it runs flawlessly. 5 installs of 3.3.x with 5-10 million contacts and they run flawlessly as well.
Let us know if we can help you transition from 2.16 to 3.x
Check out Issue after restore Database in mautic - #2 by rcheesley