Is it permissible to say, "In sha' Allah, I will enter Paradise" when speaking about entering Paradise, and is that similar to saying, "My Lord, forgive me if You will"?

There is no harm in a Muslim saying: "We will enter Paradise, Allah Almighty willing," whether they are accustomed to it or intend to seek blessings by mentioning Allah's name. It has been reported that the Prophet, peace and blessings be upon him, said during his visit to the graves: "And indeed, we will join you, Allah willing." What is prohibited is saying: "O Allah, forgive me if You will" in supplication.