I've tried all these farming money-making schemes, but tbh, I don't find any of them very efficient at all. The plants take time to grow (sometimes hours) and the yield is barely worth the time. Also, the way the economy works in NMS, if you flood the market with a product, the price plummets... so you have diminishing returns.
Simplest way to make money (units) in the game by FAR is to simply have three S class scanner upgrades on your multitool. Will cost about 1800 nanites to get, and that can easily be achieved, especially if you scan everything & upload it. Then also give your data to the entities on the Anomaly. Just make sure they're all adjacent to each other on your inventory so you get the stacking bonus.
You can make 200-500k per creature, and 50-70k per plant. It translates to millions per planet. There's no extra effort involved, you're just flying around playing the game, but you can easily get over 100 million in a day.
I have just 1 S update for scanning and I feel the difference. I tried stacking with Boltagun upgrades and it seemes to work. If you like scanning I see this as probably easiest money.
Going for bones is good cash too. I easily found millions in bones. And found a lot of tech upgrades on the way.
I now ccheese factory too. First the sents then the riddle which seems to hace randpm answer. By save scumming.
I pick some missions now too, but they dint reqard good. Especially not the deliveries. Antimatter was too hard to come by at start. Nexus looks like good reward sometimes. Best I found was inventory unlocks. Imagine that: inventiry is best unlock.
Cadual play never had me want credits. I just mined stuff and sold. Space asteroids is easy. And the first slots only cost 10 of thousands.
My cost were mainly wires loons for a shuttle I found. mats for fixing the damaged slots.
Most low upgrades I didnt feel much difference apart from some numbers changing. Best go for gold gear I guess. Slots are at premium in NMS. Scanner upgrade S really stood out. And convenience gear like BP refiner. Tho gear and upgrades isnt same thing.
I mostly visited PoIs and made my nuggets there. In between tech excavation, bones. And when I saw uranium I mined it like oxyen. for all that launcher juice - well i also have launch cost reduction.
Weapon is just miner and bullet blaster. Got dmg buffs for that now. Have a plasma launcher since hours but no ammo and cant be bothered to check how it's done.