There are some baseline metrics that are obvious right?

For example, if you have 0 conversations in a given week on average, then having 1 or 2 neutral conversations per week already feels like something better. Why? The goal is now to make those conversations feel slightly positive.

You don't need to prove your success to anyone else, so scientific rigorousness isn't needed. What's needed is your own evaluation of how things are going based on metrics you find important. The metric I gave is just an example, there are many metrics one could choose from. It really depends on the outcome you want.

Why do you want to measure it? If you feel you are improving, that's good enough in personal life.

Also, sometimes, the improvement is just so great (or paraphrased, the baseline is so low), that you don't need scientific rigor to see that things got better.

It seems that a subjective state of mind isn't a great way to tell if you are inconviencing others.

For example, an individual can feel great while being social on a narcotic, all while hurting others around them and being completely oblivious to it.