your in a weird position. you used to make a ton of videos and gained subs, but you stopped posting for like 2 years. That means most of your subscribers are pretty much dead/inactive. so while it looks like you have plenty of subs, you really don't
so forgetting your sub count for a moment, you have owned a channel for 1 month. thats way too short a time to go through a rut. do it for 6 months or a year+ then you might consider it a rut if your not growing. rather than looking to advertise on various forums to get more traffic (of course advertising is important but most forums don't appreciate it) concentrate on improving your channel. your channel art could do with a revamp and your profile picture does not match it at all. then try places like facebook groups. google+ communities. reddit etc