Without statistics, all we will say is speculation, but in general, for new members to continue joining the forum, the quality of discussions must be high so that the data is archived first in search engines. These engines are the ones that bring new visits.
Also, the adoption of more projects on publishing ANN here and the presence of Bounty campaigns will contribute a lot to enhancing traffic.
Note that a large portion of BTT traffic was coming from Google and YouTube, so trying to create visual content to introduce the forum may contribute.
In general, I think that mixer campaigns may continue here for a long time, so at least we can guarantee that traffic will not drop severely.