Take a step back before contacting law enforcement.
Ask yourself if this truly is a matter that needs to be addressed immediately? Will this issue resolve itself?
Consider your personal safety.
If you have any concern that your neighbor could react aggressively or violently to your request, consider asking a third party to help you address the problem.
Avoid personal contact.
In keeping with social distancing guidelines, do what you can to address the issue in a personal, but not in-person manner. E-mails and phone calls are better options than written notes.
Warn the neighbor.
Be sure to provide details on the problem, including the dates, times, and a description of the noise. If tackling the problem head-on doesn't work, get a copy of your local noise ordinance. Email the ordinance to your neighbor (if you have an email address) or send them a printed copy.