Connection Failed To My Worlds

For the past week or so there's been connection issues with my worlds alone. I know it's not a internet issue with my end but any person that trie to join my world simply can't connect ever since the first time about a week ago when it happened. I can join and play in others worlds 100% fine but when it's my worlds, new or old, no one else can seem to connect. I don't know what to try anymore.