I reset my password, but not sure what email it was sent to

The password was successfully reset, and I have no clue what email it was sent to. I haven't played in a couple years, and I can't seem to find the email that was linked to my Guild Wars account.

I would like to get my account back, but I no longer have possession of my access keys, which must be very important to obtaining my account.

Another question: how is the Guild Wars population today? Is it ridiculously small?

A) Contact support. That is ALL you can do, if you really can't remember anything. They will want some details from you, though...

B) GW population is rather small, and with the 7 hero update few people group these days. However, it has been concentrated to the US and EU German districts, so it's not inconceivable that you'd find what you're looking for.

If you're looking for people, the port cities (LA, Kaineng, Kama), eye of the north, Great Temple of Balthazar, embark beach (though most don't really care about this), wherever the zaishen dailies are happening. Then the usual crowds at uw/fow/doa and popular farms though these are usually restrictive in how they group. Anyone else is spread far and wide and with 7 heroes available it's much easier to make a team that suits your play style than picking up other players.

Find a guild you like. Most people are just completing hom and having their own fun at this point while people wait for gw2 or going elsewhere.