I try to follow the 80-20 rule when it comes to my choice of tools. This means my stack consists of about 80% software I already know well, but I do allow myself 20% of the stack to explore tech I have less experience with.

The exact ratio is not what’s important here, it’s more the fact that you should lean towards using proven technologies.

I wrote more about this on my blog post on Choosing Boring Technology: https://panelbear.com/blog/boring-tech/