Use an Em dash
An Em dash will strongly connect the two independent clauses. Em dashes to resolve comma splices are most commonly found in dialogue, where semi-colons and colons are avoided. This is for flow of voice of the character and for flow of reading.
3. “I didn’t know you could do that, you can do that?”
“I didn’t know you could do that—you can do that?”
Using this form of resolution strongly connects the two independent clauses. In dialogue, it is easier to use an Em dash to separate the two clauses.
10. Writing fanfiction is stress-relieving, it is a world of its own.
Writing fanfiction is stress-relieving—it’s a world of its own.
Using an Em dash here creates a flow for the sentences. The two sentences go together.
PS There is a difference between an em dash and an en dash. To make an em dash (which is the one you want to use just about all the time), type the word, make to hyphens, type the next word and hit space.