Need help with a 'money making domain name' (can i check if there is traffic going to these names?)

Your website domain name is not necessarily that important unless it conveys something completely unrelated to your content. For example, a website promoting 'zebra food' called bestbottledwater.com would be bad, whereas bestnutritionals.com isn't necessarily bad, even though it doesn't seem related at face value.

The content, trust and traffic of your site does matter, regardless of the sites domain name.

The first thing I would do is research your own domain first to be sure that what you believe could be a 'name' related issue, isn't something else instead.

If you still what a new domain name with some existing traffic, you can search for an expired/expiring domain from a few places, with some of the more popular being:

https://www.domcop.com/
FreshDrop.com | Expired or Dropped Domains | Domain Name Search
https://auctions.godaddy.com/

NOTE: It's possible to find expired domains with statistics that are appealing, but other marketers may also be looking in the same niche, which means the prices will be higher and/or you may end up in a bit of a bidding war.

There are also tools used mostly by marketers creating private blog networks (PBN's) to find domains with existing authority. These are pretty popular:

https://domainreanimator.com/
NEW Project Lazarus: Expired Domain Crawler Scraper
Welcome to PBN Lab: Expired Domain Crawler
PBN HQ - Education and Resources for Ranking with Blog Networks

you can get .club domain names which is now really cheap