Got to your account page, Computing and Credit, Computers on this account, click on View, click on Details for the computer you are after, down the bottom somewhere (i think think it is) should be a Skip button.
No more Python work.

Tasks sometimes get stuck occupying a CPU slot indefinitely, until the deadline.
Tasks occupy much more RAM, on a Ryzen 5900x 64GB of ram is not enough to utilize the entire host.
KVM might not be available on Linux due to it being utilized by another hypervisor, this will make the tasks extremely slow (about 20 / 50 times slower).
The heavy I/O operations that start with the sudden downloads / start of the VMs cause Linux systems with NVMe SSDs to become unresponsive for half a minute at a time (this is due to polling vs interrupt based I/O).

I think it is absolutely undoubtedly necessary we get an option to disable vbox tasks in the computing preferences menu and will abort all vbox tasks until then (sorry).

I'm contemplating writing a script that will only ask for new tasks once the scheduler shows regular tasks are available as well.

Read this post: https://forums.virtualbox.org/viewtopic.php?f=6&t=88405 it appears you did not set it up correctly.