I first got in June 2017, went down the rabbit hole pretty quickly then plowed a lot of money in that July/August. Back then it was a lot harder to just get money in the market, it was a few k a week limit. Made so many dumb mistakes back then but learned a lot. When I exit alt positions I usually do it in 25% blocks now, that way I can catch it if it keeps going. I for the most part hold too. If alts really run I will sell some off into btc or eth. Sometimes I'll swap btc and eth if one is over performing. When eth is under .04 btc I'll move some over from bitcoin, when eth hits .08 and up I'll move some eth to btc. If alts catch another big alt season I will sell most of them off over next few months and kick it to RE and other investments. Then probably use a good portion to buy back on a large extended correction. I don't plan on selling any of my bitcoin and half of my ETH, just in case it keeps going.I think we got in about the same time. Nobody was talking crypto. DCA back then or monster buys on dips be huge now. I had no clue how to proceed but I had a small network of knowledgeable fellas. It was helpful. I think you are right.
I honestly hodl mostly. Can unload alts as btc goes parabolic. My biggest concern is exiting a position in btc say, 100k usd and it goes parabolic. 250-500k usd. That loss of position you likely won't cover.
Not saying it's going there. Just example.
Following plan b and techdev among others . sticking to the script.