I feel ya, especially in the games part. I think my bullet hell skills (if there were even any lol, though I had normal 1cc'd SoEW and LLS out of all games, so maybe I do have a little bit of skill I guess) have been rusting, when I played the Touhou 19 trial. I just kept recklessly running into bullets for some reason. I even tried to get an Easy 1cc on all characters in Mystic Square thinking it would just be easy as SoEW, as I wanted to unlock all the Extra stages of each character to watch ZUN's Mima Extra demo play myself (and there's no available hdi which already has all Extras unlocked), but I couldn't even get past Stage 4's boss...
I also have been lazy in following Esvee_Viridae's PC-98 fanfiction which I was diligently keeping track when it was still about HRtP and SoEW (as well as some Mima extras)... I don't know why I couldn't get myself to keep myself up-to-date on their PoDD novelization. I always thought "eh, I will just read it later, maybe if they've completed the story."
Another thing I am being lazy at keeping track is Foul Detective Satori, though I definitely know why I've been lazing around: it's just become too boring for me. Though I've been recently hearing of good things about the manga, so maybe I might take a peek on it in the future.
Anyway...
Are you still a Touhou fan? Hell yeah! It's not like you've suddenly hated or disliked the series. I myself have been lazy on playing Pokemon, and I don't talk much about it or consume new content of that franchise these days, but I never considered myself no longer being a Pokemon fan, because I still love Johto.
Are you on the verge of burning out? Maybe. If you find asking yourself that question it might be better to take a break. Though I would suggest trying to "diversify" the Touhou content you enjoy. It could be searching for NES arranges of your favorite songs, or randomly searching a crack ship in Dynasty Reader. I myself have been searching for SC-88 and SD-90 MIDI arranges on YouTube, and I've recently started some sort of a self-imposed challenge of posting found fanart of Seija daily on a Touhou forum I manage in raddle.me. Whoops, shameless plug lol. (But if you're curious, it's a very lax [rules-wise] alternative to r/touhou I created 8 months ago hosted on a old.reddit-like link aggregator, which I just recently made very active after the Reddit API drama prompted the Touhou subreddit to go private for 48 hours, you can find my pet forum at https://raddle.me/f/touhou)
So yeah. Don't go hard on yourself. As Maden has said, enjoy Touhou at your own pace. Yukkuri shitte ne! :)