Those are excuses for remaining in your comfort zone. 

If your rental is up and running, you have a safety net you're comfortable with, but don't want a bolus of money sitting unused, is it possible to put the funds into a brokerage that would allow the purchase of stocks, mutual funds, or something similar?

Introvert lol though I am trying to talk to more people daily to get comfortable.

We manage in town, but I don't feel comfortable enough to purchase in NB myself.

The back end refi is something I'm trying to get more comfortable with and I know it can vary greatly. 

I don't have property management for my properties.Either way, its really up to you to figure out over time, what you will feel comfortable with.Hopefully, someone else will reply.

I currently own 5 doors in Southern California (2 duplexes and 1 single family) and I have 100K sitting in my bank account and I need to put it to work...Some of the ideas I’d had are to either leave my comfort zone (California) and buy something out of state...

It sounds like you want to get into rental property investing so you want to make sure that you are with a company that has an investing mindset and can create an environment where you feel comfortable and motivated.

Also not sure if you own a house but you could leverage that if you feel comfortable with it. 

When you are house hacking with kids, you have to place your family's comfort level first and the investment second.