Hello everyone im level 50 i wanna know where can i farm City Reputation easily? not the ones given by the town NPC. i wanna do quests from monster maps like Land of Sighs etc does anyone got a good guide? thank you!

Here's a link that may help you ^^ Repeatable Quests (REP)
You will see which REP gives you the city fame at the rewards section :3 Happy leveling \^o^/

There are guild quests from the main cities that, depending on the city, has you go to quite a few different areas. But I think those are the quests you're talking about not wanting to do.. though they are the fastest.

Do story quests on the maps for your level, like Land of Sighs etc, those pay out fame for cities as well.

There's also the item REP quests that hopeflow already linked. Please keep in mind that these quests will cap and no long be acceptable once you've hit the amount that is stated under the quest name on that guide. So if you're going to legitimately farm fame, you should do the item REPs first.