Just believe.
The unpardonable sin is not believing in the blood of Jesus Christ that he died for us and forgave us of all of our sins whether it is past, present, or future sins.
Are you looking for heaven or hell?
Look for God only.
Who told you that you committed the unforgivable sin?
The Bible says that if you repent of your sin and turn to Jesus then he will forgive you.
The Bible also says what the unforgivable sin is, and you can read about it in Mark chapter 3:Truly, I say to you, all sins will be forgiven the children of man, and whatever blasphemies they utter, but whoever blasphemes against the Holy Spirit never has forgiveness, but is guilty of an eternal sin”—
for they were saying, “He has an unclean spirit.”—
Unless you persist in calling the Holy Spirit evil, as the Pharisees did as Jesus worked his miracles, then you have not committed the unforgivable sin, the former portion of that verse applies to you “all sins will be forgiven the children of man, and whatever blasphemies they utter”