The idea is very simple: For the different pure RNG mechanics (currency drops, end round drops and crafting) there will be stacking systems that will increase chances or compensate you for your bad luck, reducing RNG a bit and creating a more satisfying experience.
Luck of the Looter
You have a visible Luck-meter showing your stack for end round drops. You get stacks based on the drop you get each round.
3 (or 2) stacks for no drop
2 (or 1) stacks for junk drop
1 (or 1) stack for vintage drop
<- Possible Luck-meter (fills up with lighter green)
Each stack increases the drop chance by 0.1% (might need to be adjusted idfk) and it resets when you drop a 5+mod gun.
Alternatively (probably a lot easier to implement and I think at this point I prefer this idea), you could recieve 1 stack per round played without getting moved to afk (with at least 4 players or so). The stacks go up to 1000 (will have to be adjusted, I did a very rough average round length calculation with an average of ~1 minute 40 seconds, you'd get one 5mod+ extra for every ~28h playtime) 2592 (which, at an average round time of 1:40 mins or 100 seconds would be 3 days of active playtime which would take well over two weeks for the average player to achieve and even for hardcore players who play for 8 hours on the server daily, it would still take 9 days to get) with guaranteed drops for a random inevitable (at about 25%, then a 5mod (at about 50%), a confused or 5mod (at about 75%, you get the idea) and last, at max stacks, an OW, then the stacks reset. Also, possibly a cooldown so you can't get these drops more then once a month.
When crafting, gain stacks based on crafting outcomes. 1 stack if you got the lowest possible mod count and 1 more if you used currency with a 50%+ chance to apply and it didn’t. Also, 5 stacks if you used 1 confused shard and the confused effect applied to the craft. Once a certain threshold is reached, it can be activated for the next craft to have increased chances for a good craft.
Alternatively, using it could give the choice for guaranteeing success for 1 aspect of the craft (max mods from available shards, get implicit from gun, apply currency effect) or applied to one of the possible outcomes of the craft to increase its craft chance or maybe even to eliminate one possible outcome.
This will grant stacks, which increase rare currency drop rates, every round you didn’t drop a rare currency and will reset once you drop one (I think the stacks should not increase heart drop chances and rounds where you drop a heart should not grant a stack or reset it either since hearts aren’t really that rare, can be acquired through daily mission and their current value barely sets them apart from tomes)
Alternatively, stacks could go up to a set amount at which you get a guaranteed rare drop or are given a random rare directly.