I also think is not good to change it every month, is hard for some altcoins to grow every month and you to cashout profit, better choose some altcoins you think will grow, Litecoin, Ethereum and hold them until you think hit your target.
I think he invests in the short term, but changing the monthly portfolio is a very confusing thing. because choosing a project for investment takes a lot of effort. From understanding and choosing the best buying price to assessing the growth in the next time. So why not continue to hold the projects you have chosen before and wait for it to grow?
It is even pointless to me because I see no reason why, not that altcoins die every month for new ones to rise, now that we even have lots of shitcoins projects all rising up, it’s quite risky to be getting involved in projects randomly.
Whatever projects we are holding in our portfolio, provided they are very solid coins like BTC, ETH, BNB, LTC, and so on, they have the tendency of always giving us profit in our investment from time to time. It could be daily, it could be monthly and it could be yearly or every decade depending on the strategy we apply to our investment.