As R937 correctly said, the answer is "were" not "was".
But what an interesting question.
You're obviously concerned about getting your grammar right, which is commendable. Now, very few English speakers would hold it against you if you confused "were" and "was" in a case like this, especially in something as ephemeral as a twitter post. Your meaning would be perfectly clear, whichever form you chose.
And yet, in your question, you used "gona" in place of "going to", which is not only an incorrect choice of words, but - more importantly - is really ugly. And you have used other obviously ungrammatical constructions like "Like what should I use, are there any better options?".
I'm not saying you're wrong to write in this way. After all, this is a friendly forum; you're not submitting an academic paper or a research document. Your meaning is perfectly clear, which is the important point.
But I do find it interesting that you worry about the difference between the future indicative and the future subjunctive, and yet you seem happy to perpetrate such sloppy English elsewhere.