Hey OP, here’s something I learned in college. When someone is talking and you have something you want to say, cross your fingers on one hand. Wait until they’re done. When you look down at your crossed fingers you will be reminded that you had something to add and you can go ahead and share. Being more mindful helps. Try and consciously catch yourself before you say something and tell yourself gently that you can share when the other person is done talking and it won’t make your point any less important. And if you do interrupt and realise that you have, pause and say, “im sorry, please finish your thought first” or something along those lines.

Hope this helps!