I’ll go back to home tomorrow!!!!!!! I’ll go back home tomorrow!!!!!!!

Generally, if I were to describe myself going somewhere in the future and it's already been determined, I would use present progressive, not future tense. "I'm going home tomorrow." "I'm going to the mall on Friday." "I'm going to California next week. In all of these cases it will usually feel unnatural to use "will." You can also say "I go back home tomorrow" or "I go home tomorrow." I'm sorry I can't tell you why plain present tense works here, I think it's unique to this circumstance where home is the destination. "I go home tomorrow"✅ "I go to the mall tomorrow"❌ "I go home next week"✅ "I go to California next week"❌ I'm sorry I can't give you a better explanation as to why, this is just my intuition. Language can be so weird 😅

I’ll go back to home tomorrow!!!!!!! I’ll go back home tomorrow!!!!!!!

This sentence is correct but "I'm going back home tomorrow" would be a bit more natural.