Do you have any thoughts on how should trade with alts in this situation?
Why do you need to trade? Just buy coins that you believe will be used 10 years form now. After a year or so revaluate your portfolio and if things changes in coins fundamentals sell, if nothing changed keep them.
If you really want to trade then trade basing technical analysis. There is plenty of info about that on the internet since is not solely related to crypto. Or on social metrics.
https://lunarcrush.com/markets?rpp=50 Watch this talk about Lunarcrush to understand.
https://www.youtube.com/watch?v=PmvrYQ_xQAMBut as I said. Easiest is just to make a research, buy and then go make pasta and forget about your crypto. Watch this:
https://www.youtube.com/watch?v=IprScr_TBGY