Mostly interested in low-level stuff, but to be honest I would like to learn all of CS holistically.
If you are in Montreal or be able to travel to Montreal from May-30 to Jun-02, RECON 2022 is going to present a lot of trainings.
If you are in EU, someone on HN mentioned Vrije Universiteit Amsterdam which has some excellent malware analysis classes.
There are some pretty nice ones in EU as well, with low fees / no fees depending on your passport.
Also don't care if it doesn't give diploma.