I don't expect to get a lot of traffic. Barter probably didn't have that many.
Current online users = number of people who made a request to the server in the last 15 minutes. It can mean there's always only one person online at the same time. :P
Heck, half of the site usage stats for the first month are my own activity.
So, I'm pretty sure we can deal with the extra traffic when it's online ;)
If not, then we can always upgrade the server, or move the site to a new server entirely, or multiple servers with load balancing, etc.
To be honest, I'm not the one who should reply to this-- the very fact that I have Alex host me is so she can deal with these things for me because it helps get more experience as a host.
(Which reminds me, Alex, still no plans to install php_ext_br for brotli support? That would *really* help with the traffic :P)