a. There's (just) a lot going on right now.
Without 'just', I think (a) means
b. "A lot is going on right now"
rather than
c. "A lot that's going on exists right now".
Right?
Now, if we add 'just' back in (a), where do we put 'just' in (b)?
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Sign up to join this community(c) doesn't make any sense to me. (a) only works in the sense "The only thing is, there is a lot going on right now" (as an excuse for being too busy to do something).
I differ from DialFrost in thinking that just here means 'simply, only' rather than 'recently'.