Still reply to support tickets submitted to an incorrect category, if just to suggest the correct category.
Real example: I submitted a support ticket in April 2021 asking for guidance on if it was okay to stream from a location. 4 months and 2 follow up emails later, no response from Twitch. I had to create a second support ticket referencing the first ticket number in the subject line. 2 separate follow ups on that second ticket, and finally I get a response from a human Twitch employee. The problem that caused the first ticket to go unanswered: "It seems the original ticket was submitted under the wrong category, this may be why you did not receive a response for so long." I had literally no clue I'd used the wrong category.
So here's my suggestion for how to fix this whole headache and prevent future ones. If a support ticket is submitted to a wrong category, rather than it being ignored by Twitch employees, let the user who submitted the ticket know what the correct category would be. If we don't know we've incorrectly submitted a ticket, getting ignored will not solve our concern. That puts the onus on users to further clog up the system by following up or generating superfluous tickets just to get any kind of response. I think that a correct-category email would really ease the strain on all parties, both Twitch staff and streamers themselves.
In addition, I believe Twitch Support should increase the number of available categories, considering that there is not a category for issues regarding the addition of phone numbers to accounts, among others.