Let me do a quick math.

Each featured C6 Character cost around RM 4,000-6,000, let's make it 5k then. RM 5,000 x 5 = RM 25,000.
Weapon banners were not guaranteed previously so hard to count. But judging from a few R4 and R5 featured weapons that you have, you probably dump at least RM 15,000 there.

Your account UID is 83X but already AR59, so very high chances that you daily max refill resin, that will be another RM 10k for daily resin refills(RM 1200 per month).

Total will be around RM 50,000, or around RM 4,200 per month