There are emotional aspects and physical aspects. - Talking about physical aspect, there are many techniques to overcome a block but remember to pause, do not force the block, slowly combine "flexible rate" and "light contact" technique to say it. You must start slow and maintain the slow pace throughout a conversation. You cannot just talk fast and only slow at a block, it will not work and you will panic right at the block. Find a group call where you can practice regularly. - Talking about emotional aspect, "redefining stuttering by John Harrison" book is a good book to start. Are you avoiding and holding back yourself in speaking situations? Read the book to find a way to change your thinking about speaking situations. With a right mindset, most blocks will disappear. - I have seen many people recover from stuttering. I have talked to them in a group call. The progress they made is tremendous. Good luck!