For me it was actually the Bankless Podcast. I was a fan of the "crypto"-space in general. I felt that bitcoin was archaic and energy wasteful compared to the smart contract capability and proof of stake cryptos. I was a big fan of ethereum with all the hype around the Merge, but really thought that Cardano was the better technology.
I bought a Ledger and subscribed to the Bankless Podcast and newsletter. They wrote what seemed like daily (or multiple per day) emails that instructed you on what ethereum layer-2 was potentially going to have an airdrop and where to move your Eth to best have the possibility of getting the airdropped tokens.
Every night I'd read through those emails and move Eth around to various L2's. Fortunately I was doing all this during the bear market so hadn't gotten rekt'd on the way down.
It always bugged me a bit that the Bankless guys were so pro-Eth and anti almost everything else. They only really talked about bitcoin in the context of what ethereum did better or to make guesses about when the "flippening" would happen. Solana was the only other L1 that they promoted for some reason. Cardano was an afterthought.
I can't remember how I decided to listen to one, but I found a bitcoin podcast, which happened to be one of the early episodes of Cafe Bitcoin. That got me down the bitcoin rabbit hole. After a few episodes of that, several of Livera, and a host of others, I became bitcoin only.
Trying to participate in all the L2 "give aways" on Bankless was also extremely stressful. I didn't realize how-so until I stopped doing it. Previously, if I skipped a day of following their instructions, I'd get anxiety about how I should be doing x, y, or z to improve my chances of getting an airdropped token...once the pressure to do that was off, life improved a ton!
I sold all my shitcoins and went bitcoin only. I now cringe anytime I hear someone talk about "crypto" or "blockchain" or the horrible energy use of bitcoin FUD.
The more I learn about the creation and early days of Ethereum, I realize how scammy the entire shitcoin sphere is.
Back in 2017 I did get a little bit of BCH in the fork too. I had absolutely no idea any of the politics about the fork and only knew that I had this additional token that I miraculously got for free and someone actually wanted to buy! I sold that and bought more BTC (which I stupidly sold during the run up in the next bull market).
The final straw, which was happening around the time I was unsubscribing from Bankless and blocking all the emails I'd still get from them, was Celsius going bankrupt. I had some stablecoins on their for what they assured me was a very safe yield. None of that anymore, BTC only.
The Ledger is in the drawer. Coldcard, Passport, Jade, and Seedsigner are my mainstays now. I am also buying, holding, and using bitcoin. I am not holding bitcoin for a future conversion to USD but for future spending as bitcoin.