Try lightly spraying your spool with water mist, put in the fridge or freezer for 30 minutes in a zip loc bag. It will let the thread absorb some moisture which will help with thread breakage and tension. Remove it, rethread the machine and try again. Since you already put a new needle on, that could have been another issue. Remove it and put it back in again making sire the eye is aligned forward. Check your feed dogs to make sure they are up and working. It might help to give the machine a good cleaning also, especially under the throat plate and the feed dogs. Make sure there is nothing stuck in there. Oil you machine if needed to ensure smoother operation and recommended by the manufacturer. Good luck.