I bought a good amount of BTC at $40k, at the time I was worried I was too late, glad I got in even this late. I plan on buying some more next time it dips.
I'd actually bought a small amount ages ago to send to someone and left some change(less than a dollar) in the account and forgot it, reopened it a few weeks ago and that change had turned into like $20. That hurt.
I had something similar. In 2016 I got an app called TenX for Bitcoin Debit Cards. I setup two for employees. They were never able to get a card. Mine stopped working after one transaction. The fee to buy a card was $15 of BTC and all three apps had a bit of shrapnel left in them. A few months ago I looked to see if they had new debit cards. They didn't. But between the three accounts there is now about $900 of BTC . I think the price of a single coin at the time was $600.
@Mikeyd03 - on DeFi. The total cap for DeFi coins is about $20B, up from about $2B 6 months ago. $40B locked and $10M in gas fees per day. I believe in four years you will be able to put a zero and change after all those. I think one of the best things to look out for this year are platforms that can reduce gas fees. That I've seen AnySwap, Serum and possibly Reef.
I thought as the space matures the sort of wild gains people have had from BTC, ETH will not be seen again, but there are plenty of DeFi projects that are and will delivering the same kind of gains.