Take your time and set good expectations. Everyone says this on TPF, but I didn't internalize this as much as I should have.
Without significantly spending over 2:1, it will take at least a year since your last offer for a K28 and even more time/spend for K25 (3:1-5:1 is not unheard of). In the days of rising Chanel prices and everyone and their mother trying to get a Birkin, those who are offered multiple quota bags a year have a strong history with the store, especially in a competitive place like SF that seems to be getting more competitive by the day. Many clients have not been offered bags in 1-2 years, so there is a long backlog which makes getting a second bag within a year of your first especially hard right now.
Obviously everyone's experience is different, and you may be very lucky. At least it feels like stock has improved since mid-late 2021.
I'm not trying to scare you but help you stay off the slippery slope. Take your time and make sure your finances are in order before you fall into the H deep end! So prepare to wait a year with some reasonable spend (: