Of course, I'm happy to share.
Basically, the heart of my passive income is my oil rig. I've put 39.375B into it so far, which is really all that's essential, although there's about 10B more of upgrades I could technically purchase (some of those would be useless, some of them would actually be helpful). On good days remaining about even in stock, it can earn 50M.
I also have a 50% stake in my torn spouse's oil rig currently. He runs it quite well and that was a great investment. He does have the option of buying me out one day, though, and I wouldn't blame him at all for doing it (frankly he deserves that), so I don't count on that as an eternal thing. If/when that day comes, I'll put the money into the stuff below.
I used to have a great stock portfolio and 10 max PIs I rented out, but among other expensive things, I exchanged them for quicker progress on my oil rig. I'm slowly working toward getting the stocks I sold back, and then the list of stocks I never owned but still want, before anything else, because Ched's decision to make stocks increase in cost by ~10%/year on average means they'll all halve in ROI every 7 years or so, which means it's now or never on a lot of them. I'm intending to go much lower in ROI percentage than max PIs would offer, I know it's objectively stupid but I just like the idea of having them and I want to do it before they're like 0% ROI. The list includes a lot of technically zero-income stuff, though, like a third BAG BB, a fifth MCS, some EVLs to match that, and four CBDs.
Once I'm done with my very long list of stocks to purchase, I intend to slowly amass 25 max PIs to rent out. They do take 6 years to pay themselves off, vaguely, but I'd say that's well worth the steady income all the same. I think once everything is said and done, with my goals, I'll have about 200B NW. Despite having just shy of 10B dex, I generally don't SE (most of the ones I've done have been gifts), and won't until my goals are done. I keep getting sidetracked with my cash, though, getting various nice things; I'm working on upgrading my Vanguard set (still need to find phenomenal Vanguard Body and Vanguard Gloves somewhere so I can have +200% dex multiplier when at 0% addiction), and I would like to acquire a nice Stricken weapon, a great Motivation weapon, and a nice Execute, and I do eventually need to upgrade my secondary (a 28% Eviscerate Blunderbuss) to a better, dual-perk version of itself, but after that I think my inventory will have everything I could want.
I can't actively stock trade to save my life, I much prefer the steady income of the BBs. There's something really satisfying about something being guaranteed to come in. I also mug when I can (legitimately, I did try the bots briefly when they were new but it didn't take long for me to be completely disgusted by them and stop, because they're just cheating, really), and that helps me a fair deal, at least when it goes well. I don't like to count on that as an income, though, because often life doesn't really allow for it.
Having spent so many dozens of billions on my gear, I feel like I'd advise a smarter person to lean into all of that later in the NW growth curve than I did. I always say that compared to top end gear, you can typically get ~85% of the value at 10% of the price. It's also important to stay away from gambling, unless you're great at poker, in which case you're set to be among the richest people in the game (basically all of whom are poker players). One must remember that for every rich gambler, there's someone or a heap of people who lost the same money, though.
My rule in general once I own a stock block is to never sell it unless I'm just rearranging my assets to a higher ROI thing (since they fluctuate in price and all that relative to their benefits). I've mostly stuck to that, except when I purchased my primary (10B) and my melee (13B). Moving the remainder to the oil rig was a great move though. That method keeps your money safe from yourself. I find I always grow stupider if I have a lot of liquid, so it's better to sequester it safely.
Sorry for the length of my reply, and for it being a relatively generic plan. You already know what to do since you got your foundation, it's basically more of the same, and with lower returns. I'm estimating my daily costs to be about 15.34M (2.55M for 3 xan, 8.5M for the corresponding 34 rehabs after natural decay, 2.79M for 90 points for all 3 refills, and maybe 1.5M for an average day of 150x 100k slot spins chasing the Jackpot merit, which I hope one day will disappear as a necessity). That means I have to aim for vaguely 116M of passive income each day. It's doable, will just take a very long time. I figure from there, that funds about 6.74 SEs/month, which could by itself double a stat every 10.39 months (obviously, that would be faster if gym training was included in the process). That would mean it would take about 31.15 months from achieving my NW goals to drag my dex up from 12.5B to 100B if I relied only on that, so it's not too terrible a length of time (I'm thinking I'll continue to train dex in the gym a hair over half the time as I do now, though, so it should be faster). That's all I have my eyes set on in terms of big goals once I have all the stuff I want. I'm glad at this point that the list of non-investment purchases I intend to make is fairly short.