My suggestion is to make 2 new versions on the weapon/trinket slots: 1-day slots and 7-day slots.

My reason for suggesting this is that some non-active players, who are indeed devoted and dedicated to the game, do no have the time to play everyday. These players may not play that often, but still love the game enough to play when they have the chance, and therefore would like to use multiple weapons and trinkets. Buying the 30-day slots would be a bit expensive when they would only be playing 5-10 days a month.

Suggested prices for these variants are as follow.

1-day Weapon Slot: 25 CE
1-day Trinket Slot: 15 CE

7-day Weapon Slot: 115 CE
7-day Trinket Slot: 70 CE

These prices would make the shorter variants cost more than the 30-day one, meaning that active players can't just buy the shorter ones to save money; it would only be cheaper if you only used slots sparingly. Costing more would also help OOO, as it would give non-active players (the older players with a job who actually have money to spend on SK regularly) another reason to spend their energy, as most inactive players opt to never buy the 30 day slots as it would be a waste if they don't even have 14 straight days to play the game.

The only argument I can think of against this idea is that the original slots are cheap enough that even an inactive player could still afford it. After all, a weapon slot only costs 8.3 energy per day, while trinket slots costs 5 energy per day. But even so, spending a full 250 CE for a 30 day slot when you would only be using 1-2 days of it is still over spending.