Is something like this possible
Start with an unshaded ☆
You spend x amount of

points to add more stars
After you reach 5 ☆
It upgrades to a shaded ★
Once again, you spend increasing more (ratioed to be higher)

points to add more stars
after u reach 5
It upgrades to a yellow coded
Ok sidestep away from this (but this is still all on topic.. trust me)
User Colors
If we can define how user colors go (excluding the special & staff ones)
Member -> donor -> vip -> Trader etc
We can use that same pattern progress on Star colors
ok back to stars
so for examples stake
Let's say the color scheme goes like this
☆ -> ★ ->

->

(this is a green star, i swear to god..) ->

(blue..) ->

(this is a star) ->

We can keep adding to it later on if needed.
But it will increasing be much much harder to "evolve" the stars as you progress further.
Okay, side stepping away stars and onto

How would we want them to obtain

We could have it layered in multiple ways (if possible)
In engagement, we look at a few things
mainly these 3 stats on the high level
- Attendance
- Engagement
- Quality
But how does that translate into

?
Attendance = We want people to return to the forum for whatever reason.
Means, we give a

for jumping on the forum each day (it does not have to be much at all, 1

or even half a

is enough). If we can't do halfs, we can always set the "upgrading the stars" to a higher amount to counterbalance this.
Engagement = We want people engaging in the forum and participating in discussions.
(once again, if possible)
We can start off with, every single day, if you engage (whether you start a thread or reply to one) at least 5 unique threads. you will get x

.
That's the most basic of it all.
Then after those first 5 post, it will RNG between 15-30 post (free feel to adjust these as we go along) afterwards to give you more

. Each time you get the

that will reset or if the day ends it will reset.
Further, each section of the forum will provide a different weighting on how many

you will get. It could also be RnGed like 2-3 or 3-4 etc if needed.
For example, casual talk in The Saloon will clearly give the least amount of

.
We could also add a weight system (if possible) to how long the post is, the longer the post, the slightly higher weight to get a bit more

.
For example, under 100 words = 0 extra multiple
101-300 words = 0.1% chance of getting maximum

301-500 words = 0.2% chance of getting maximum

501-1k words = 0.3% chance of getting maximum
etc
Lastly,
Quality
This one is a bit manual, or maybe it can be automated.
But if we do have newsletters in the future that features post
Or a thread getting pinned (non-paid) due to being something of quality or a good announcement/urgency thread (like Elementor plugin has a zeroday exploit, and everyone needs to update to the latest to patch it)
Each of them will get a x amount of

.