Why is it definitely a bubble? Was Apple, Google, Amazon a bubble in 2009 / 2010?
It's an emerging technology. There's going to be shitcoins that exist, just like there was bad technology back then. Pick your horses wisely.
Using the same analogy, you've purchased Blackberry, Arcsight, Microsoft and Red Hat, when those three stocks above were prime for the taking. Microsoft you'll make out alright with (I compare that to your purchase of ETH), the other ones you purchased, might be popping nicely at the moment, but what is the long term viability of them? Thats my concern with Doge & most alts. Doge is an outliner as it's clearly just a joke, but a lot of other alt coins are nothing more than a great idea with brilliant marketing behind it. The deregulated nature of crypto makes this easy to achive.
Analogies aside, Dogecoin is a pump and dump and is either going to fall hard at some point, or get hacked by a 51% attack due to it being "secured" on litecoins blockchain.
VeChain I dont know a ton about, but as a lottery ticket you have to ask yourself how much you're willing to buy short term, relative to your earnings potential. The max supply of that token is 86+ trillion tokens. Compared that to the 21 mill max of Bitcoin. So if you're buying it to potentially see BTC-esque numbers you're sure to be disappointed. Short term, I'm not sure what room is left to grow, as it's 10x this year already.