How to get to 1,000 subs after a "Successful video"?

Hi all! Stumbled upon this subreddit today and I had a question. Been doing this for like 3 years now and I feel like I've hit a wall on growth and was wondering if anyone has some input. Channel name is "Snackugo" on YouTube and i have 684 subscribers atm. My last video focused on Final Fantasy VII Rebirth is currently far and away my best video (atm sitting at 13.2k views and 3.6k watch hours with a TON of engagement!) I'm past the 4,000 watch hour minimum for the partner program but I still need that extra 300 or so subs to apply, any suggestions on things I could switch up to bring more eyes to my channel?