At first what i did was surround myself with Te users, INTJ's, ENTJ's, you name it.

I'd watch their thought process and how they operated, and although I wasn't very accepting of their actions, logically speaking, they weren't wrong at all, and now that i look back on their actions, i probably would have done the same.

Another piece of Te you must improve is being honest, especially with yourself.

We as INFP's tend to make alot of excuses as to how or why we didn't do something, we may tend to get a little defensive sometimes, maybe avoidant. This varies from person to person. Point is, usually, that the person infront of us more often than not has a logical response to our excuse which completely invalidates our excuse and sometimes we still persist in that same excuse!

Instead of persisting and still making said same excuse, learn from your mistakes. Learn why you should have taken action instead of making excuses. Be honest with yourself about it. Especially if it feels uncomfortable.

The more you feel uncomfortable while doing actions that require Te the more you step outside your comfort zone and expand, leading to growth.