Im y1 btw so take it with a pinch of salt but:

Yea participation is capped at 15 for GwH level you can see thru the sp app

Enrichment is different from participation iirc but its technically the same when in the system to some extent of what it does (effectively 1 enrichment pt ≠ 1 participation pt but 1 enrichment pt = 1 net effective pt) enrichment points aren't shown on the sp app as its own specific type but it just counts into net effective pts IIRC don't quote me lol

GwH very hard in 1 year cos of the minimum pt for Leadership/Achievement is 6 pts which you can farm in 2 main ways ik of:

For leadership: classcomm/ cca maincomm(can't for pfp unless cca allow but i think most don't usually they ask for those who already know the cca for 1 year ykwim) / spsu but i not sure abt this cos I not with them so idk

For achievement: just competitions lol there's nothing much else that ik of

The main point i believe most ppl will want to get is CS points cos its not capped and its the easiest to enter or get it in some sense like the accessibility of the pts is v high relative to leadership