I canceled the redirection,my ranking has fallen.

I canceled the redirection,my ranking has fallen.
You have redirected three expired domains. I waited 5 days and then I turned off redirection again.
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Suddenly, my ranking dropped by five levels. I was surprised and connected the redirection again. In this case, will the ranking be restored?
why would you turn off the redirection just after 5 days, just do the redirect and forget about it until you drop the domain
Why did you redirect in the first place? To gain ranks right? Then keep redirecting the domains!
The redirected domain has a high spam index, so I canceled it.
In any case, you should give time to time, google takes time to react, in fact many good changed usually comes with serps loses to begin with at least in my experience (for example when you activate something like amp in a website it usually drops to nowhere a couple of weeks/days)
The spam score is not an issue. Check the domain manually. Check the link profile, anchor cloud, web archive history, etc. to find out how good the domain was. That third party score explicitly Moz spam score doesn't indicate anything strongly.
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The domain in question. Can you check it out?
I wonder if the reason for the drop in Google Ranking is due to the cancellation of redirection or the quality of the domain.
Is the quality of the domain so bad that it ranks down?

Otherwise, I'll reconnect the redirection.
When you redirect the expired domains to your money site, the redirection redirects the link juice from the expired domains to your money site - So if it bumps your ranking upward, then those expired domains are good. If they did nothing during initial redirection, then those are not good domains. Else, if you were already enjoying better ranking earlier - re-establish the redirection and wait for them to update that accordingly.
You may have just fucked your entire rankings by connecting it back. Heres what happened in googles eyes

"User redirects an expired domain, user gets rid of this after 5 days, maybe hes trying to game the system? Lets lower his rankings a bit to see his reaction, OH SNAP the guy just connected it back up, he is almost definetly trying to game the algorithm, lets punish him."

You my sir, just left a giant footprint because you are impatient and did not study a method before implementing it. Welcome to the biggest mistake you can make in the world of SEO.

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You going to have to leave it redirected for a couple of months at least now. DO NOT UNDO THE REDIRECT AGAIN.
if I were you ,i would have made a PBN out of them. you get much more mileage that way.
5 days mate? What do you think you would gain in just 5 days?

Redirects don't "give" the domain authority to the other domain but it just "redirects" the link juice for as long as you keep redirecting it. Once you remove the redirect, you'll lose that boost.

I just bought an auction domain with good clean backlinks that was redirected for over 10 years. Hosted it and guess what? It's ranking great. Even 10 years isn't enough time to transfer away authority.
You may have just fucked your entire rankings by connecting it back. Heres what happened in googles eyes

"User redirects an expired domain, user gets rid of this after 5 days, maybe hes trying to game the system? Lets lower his rankings a bit to see his reaction, OH SNAP the guy just connected it back up, he is almost definetly trying to game the algorithm, lets punish him."

You my sir, just left a giant footprint because you are impatient and did not study a method before implementing it. Welcome to the biggest mistake you can make in the world of SEO.

You going to have to leave it redirected for a couple of months at least now. DO NOT UNDO THE REDIRECT AGAIN.
If it was that easy then negative SEO attacks would be so common.
Wherever you learnt redirect trick, just know its temporal. Its best you turn the domain into a PBN or give it away to someone that values his money site.