Thanks. Sorry for lack of clarity, a router power cycle is when you turn it off for a few moments, and then start it back up. This can clear cached data and can fix issues. It's less effective with more modern routers, but it's still worth trying.
Thanks for trying the other account, at least that eliminates an account-based issue.
For the next step can you try restarting with a Clean Boot, to discount potential conflicts with 3rd party software?
How to clean or safe boot your PC or Mac
It's also worth re-whitelisting the game and Steam on your security software, in case that's a factor.
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