Hard inquiries stay on your report for 2 years but stop impacting your credit after a year
It’s not a huge deal unless you’re planning to buy a car or a house or something relatively soon
You can dispute them but they were all legitimate so you might as well just wait, it’s not that long. Your score was excellent so unless you incur a ton of debt It shouldnt go down all that much. And again, unless you’re planning to do something that is contingent on your credit within the next year or two it doesnt really matter
Significantly better, and if you have in ear headphones it’s worth it to see if you can get custom molded tips while you’re bothering as this will noticeably improve audio quality and noise cancelling