Entirely depends on what kind of guild u are looking for.
As previously mentioned u can try to find guild in server discord https://discord.gg/livingflame
. But, on average, people who recruit in those are kinda semi-hardcore/hardcore, at least claiming to be as such. Rarely have I saw casual guild recruiting in a server discord.
Second choice – is trade/lfg chat, but it is kinda like a lottery, but looking for a guild is a lottery itself.
If u are looking for a casual guild I would say look through in-game chat, there are usually some recruitment going every day. If u are looking for semi-hardcore/hardcore guild, I would say server discord is the way to go.
Also alliance pvp server discord : https://discord.gg/m5Z4ck8p
in case anyone needs, there are some guild recruitments in there too.
And the last choice – is joining a guild after a semi-guild run or w/e. Never done this myself and as u can see not usually working out.
On average semi-guild runs, at least at this phase (10-mans), are a tight-knit group of friends who are lacking a couple people for a run, so joining one is usually really hard, or a guild with few sign-up’s missing for w/e reason.
As for spamming “LF guild” urself, it’s kinda waste of time and most of the time u will get auto invited into leveling/botting guild.
Edit: Also rogues one of the most popular classes, and in most guilds there are already couple present, also they are kinda in a bad spot in PvE rn, so it makes it a bit harder to look for non-casual guild as a rogue player.