"Unity is busy..." Active input Handling Problem, Unity is stuck

In my project I have added Unities new input system and removed it switching Active Input Handling to the old system, after having decided not to use it.

upon reloading, it seems like it is an endless cycle of unity being busy.

Unity will not let me change back, not work on my project.

Closing and reopening the project repeats this process. In its current state, as stated, I am no longer able to work on my project because of it.

This is unity 2020.2.5f1

Please let me know any advice, because I cannot afford to restart this project.

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Also Downgrading unity versions did not help, nor deleting the library cache

Possible solution found
I downgraded to a previous version, and upgraded it back to still suffer the same condition.
At my wits end, and as a last ditch attempt I just full restarted my computer. This morning it opened without the loading error. There were no red flags my computer was acting up before hand, so I’m not sure why this worked.