Besides Reddit, Quora is another q&a platform you should consider.
Search questions that are waiting for your answers. 🙂
You can use QApop to automate your marketing.
Slack / Discord / LinkedIn / Facebook groups can also work.
You can find the related communities by doing a search on the pages below.
Slack - https://slofile.com/
Slack - https://top50slack.com/
Discord Servers - https://top.gg/tr/servers Discadia - https://discadia.com/ Discord.me - https://discord.me/servers
For instance, we launched a side project related to Customer Success Jobs a time ago and below you can see its engagements in Slack groups.