How long for Mirtzipane 30mg to kick in

Hello. ive been on 200mg Sertraline for 16 years which worked like a dream for GAD and depression. It suddenly stopped working and Dr has put me on 15mg Mirtzipane and increased to 30mg after 2 weeks. Would be great to hear how long it took people to feel better. It has fixed my insomnia but i am still getting anxiety symptoms despite the seretonin rushes although i know its early days. THANKS

5 weeks into Mirtazipane in total and 3 weeks on 30mg and the anxiety/depression not lifted after initially feeling better. Wondering how long to wait until trying 45mg?