Do you go to the dungeon?

XP for gold

Any OSR player that joins the group might be expecting that finding gold gives you xp. That's how it was in the old game. But in 5e, all the gold you find on adventures, in dungeons etc, the xp has already been factored into the monsters (you don't have to kill the monster, sneaking past them or talking to them is fine).

What about money that you make trading, running the domain etc? Well, you have to be making a lot of money per month for it to give you xp. For level 5, you have to make more than 650 dinars (dinars = gp, dirhams = sp) in month in this way. You get 1 xp for every 5 gp you earn above the threshold this way. So if you earn 700 dinars in a trade deal, you get 10 xp (700-650 = 50. 50 / 5 = 10).

LevelDinar threshold
125
275
3150
4300
5650
61,250
72,500
85,000
912,000
1018,000
1140,000
1260,000
13150,000
14425,000

(This rule comes from ACKS; but there it's one xp per dinar — however, in ACKS it takes typically about five times as much xp to level up as in 5e (averaged over the four main classes). You'd be a pretty broke caliph if we used the ACKS rule; i.o.w. I've transposed their curve to our econ so it matches.)