Which of the available options for downtime from XGtE would give the most money after one week?

In the "Downtime Revisited" section of Xanathar’s Guide to Everything, pages 123-134, it gives you various suggestions with what to do with a week of downtime. My character is being given a week of downtime and they need to make as much money as they can within this week.

Which of the available options would give the most money after one week?

Some thought/restrictions (although answers can still mention these excluded options alongside the best for my case if they wish):

  • Crime: My character isn’t really built as a rogue, and my DM may well require me to have a relevant background, like Criminal, to qualify for this downtime option, so this one’s out.
  • Gambling: This can go well, or badly (that’s why it’s called gambling), but I don’t have that much money to begin with, so although it’s probably the best option if you have lots to start out with and are happy to risk it (as the amount you can make scales with how much you put down, assuming you win), it wouldn’t really help me much as the risk isn’t worth the reward when I don’t have much to start with.
  • Pit Fighting: Obviously, all PCs can fight, since D&D is a combat-centric game, but I’m not a combative class, I’m a warlock who’s trying to go for more of a "summoner" playstyle, so this probably won’t be my strong suit. Then again, it appears to be "nothing lost, nothing gained" if I lose, so if might be the best one for me, unless the others are better?
  • I was considering just going with the "Work" option, and hoping I roll well enough to get that extra 25gp, but the Pit Fighting option already outpaces that even if I only roll well once out of three times, so I’m guessing that Work isn’t much good after all…

So to clarify: I’m excluding Crime and Gambling as I don’t think they’ll be appropriate, and I’m looking for an option that tops Pit Fighting, which appears to be the best one at a glance for making money quickly.