Something that helped me was being spontaneous and funny, even though my personality was the opposite of that. I started creating an alter ego that would be exactly what I described above, I started to imagine myself being him, how well he talked, he was hilarious and spontaneous, I cultivated this in my mind, and then I started talking to strangers as him, it may sound strange It's confusing, but it works great for me, it's not perfect, but you should definitely try it!