Definitely sad to see glitch go, but after hours of looking and just stumbling across a few, I found a few decent ones that I use to just make just some random things for fun.
CodeSandbox (supports most languages but has some limits i believe)
CodeHS (have used this for school the past few years and the “sandbox” area is decent and pretty user friendly if you are using html or java, but also supports quite a few languages. I’m not entirely sure if you need a district account though.)
these are the closest ones i could find (kinda) similar to glitch but still have their differences. Replit used to be my backup but their limits are insane now 