You cannot ask for a domain name suggestion from a public discussion. There are many chances for others to register it. You must either think your own domain name or use any domain name generators.
It is obvious that most of the niche domain names are already taken. In such case, Not all the taken domain names are been used. Most of them are kept parked for sale. If your desired domain name has been already taken and not been used, You can contact the current domain registrant by having a domain whois lookup from
www.WhoisXY.com on the specific domain name and seek for a domain bargain. It is the best possible way to acquire an already taken domain name.