Do you think it can be a good time to invest in some altcoin for hodl with the BTC pair instead of USDT pair?
altcoins have never been good options for "holding", they are just too unreliable in long run. most of them also have unlimited supplies which means automatically they are like fiat and are inflationary so there is no way they could rise in price in long run hence making "holding" a very bad decision.
Altcoin had a two sided coin. Sometimes it make a huge profit even 100 percentage rise. But the other side is, the same altcoin may disappeared from the market suddenly without any doubt. So the altcoin is not safe to hold for the long run, to keep u on safer side.