Do you allow bots to view your site? In ACP->Manage bots you should be able to see which bots have visited and when.
Generally, it should happen organically if you board gets linked and referenced from elsewhere.
You can also read through Google Search Console
and Search Console Help
for direct engagement with Google search and some tools that might help you.
Normal people… believe that if it ain’t broke, don’t fix it. Engineers believe that if it ain’t broke, it doesn’t have enough features yet. – Scott Adams