There are tons of quests, which, to this day are tuned for more people. A lot of it is in TBC / Wrath zones such as Icecrown and Shadowmoon Valley, but there are also a couple for even early zones like Ghostlands. And in BFA there were many “suggested players: 3” quests, too.
Why did you remove the group finder for these quests?
Worst part, now none of the BFA world bosses have any groups going for them, and because of the stupid scaling system, they can’t even be soloed anymore (despite all of them, up to Darkshore anyway were soloable during patch 8.3)
I rather skip non soloable quests on level chars to have no WTS in the lfg section tbh It was rlly getting out of hand (it was so bad that there were more WTS groups then actual groups that were looking for players)
There are tons of ingame community’s for leveling, you can join those and ask there for help if you are stuck ^^