Fear and scarcity—> Abundance

We are currently debt free, and move to a new area closer to work for my husband and I and we believe better school option for our kids.
The new house in this area means debt, and we got feedback today from loan offer with a higher than average interest rate.
I realize that my previous feeling of abundance while being debt free was based on my thoughts about my bank account, because I have now spiraled into fear and scarcity before there has been any official change in the balance.
What deliberate real thoughts must I chose to think to be in a space of abundance.