3. Once the bull run is over I'm most likely going to keep all my bitcoin and probably most of my Ethereum. I'll sell most of my alts for stablecoins but keep small bags of the ones I want to keep through the bear market. Is this a sound strategy?
It is a really good strategy, I have a similar one. It is better to sell off all altcoins when bear market starts, as they can drop by 80+% easily and you don’t know which of them will recover later.
5. After the bull run should I just put my stablecoins in something like Blockfi during the bear market? Or is cashing out to dollars and investing in something like real estate a good way to defer capital gains taxes?
It is up to your tolerance to red numbers. I mean that if you are a long-term investor and can put up with situations when you see big losses and you can wait several years more, you can hold your crypto, but if not, you should invest in something more conservative until the next bull run.