I've seen many people left with no quests to do and are not sure where to get one, so this guide is dedicated to those.
Below I have explained with images most likely places to find new quests but first some basics.
Quests are of 3 kinds classified by the color of the frame:
You must have atleast 1 yellow bordered quest active at all times, if it's not, that's probably why you're here.
Note that if you already have one quest active, you may not find another one before you complete it.
So if you don't have even one, this is where you should look:
In the section below, I mainly focus on the yellow bordered main quests. Events quests, mostly you'll always have one until you complete the event. Blue quests, well they are optional, but everything here applies to them as well (except gods residences).
Select your region to expand it and see where you can find quests for your region.
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Sometimes it also happens you are stuck on a quest, unable to complete it. This could be a real glitch/bug or something you can't figure out.
Mostly it will be things like you've forgot to return the items you collected, put up something somewhere or did not talk to some character.
If you are in Egypt, Scandinavia or China, there are some quests with finding journal pieces. If you're at one of these, you'll have to find the journal pieces by going back to the previous mines, a small journal page icon will indicate which mines have the journals.
This website can help with all of that, just search for the mine or choose your region/god from navigation and find the location you're stuck at.
There are videos/maps there which will help you complete them. If it doesn't help, then it could be a glitch for which you'll have to contact support.