Re: What should a trader’s investment portfolio look like ?
I don't believe that ALL traders don't have any portfolio at all. What I believe is that they have funds intended for trading, and they also have funds for holding as well. I also trade (not an expert though), but I still hold some coins just for capital appreciation because I don't want to risk all of my money into trading since we know how risky it is. As for the RSI thing, thanks for sharing as well as it would help newbies like us in our trading journey. 
honestly that's fair, personally I don't consider a short term holding such as 1-3 month as building portfolio at all but some trader might do, and difference like that is pretty normal.
I also invest in some like SOL, BTC, and ETH, been doing DCA lately since market for alts also looking pretty weak which means good opportunity to buy and only intending to hold until feb, personally I don't consider my alts that aren't big three and only for short term holding such as 2 month as portfolio at all, I consider them trading, but my big three that made up majority of my investment are definitely my portfolio. I also have 5% of my money for margin trading. basically it's relative to each other's opinion.