I beat last event, so I can share what I remember.
I'm idle warrior with Felicia like you are
There are actually only few things which do you need or have to do.
1. Upgrade only Felicia!
2. Craft - get Mojo Amulets (idle) and Maneki Chimpo (ymens), that is enough.
3. If possible try to reach lvl 90-100 with both crafts but get idle 80+ and ymens 70+ at least.
4. If neccessery, don't hesitate and use boosts Ginseng Beverage and Advertisement Campaign when end is near.
I stopped restarting game about 5 days before end in last event. Than I reached lvl 1700 after 4 days and than I did last 100 lvl with boosters in 12 hours.
But I have to say that I had feeling last event was little harder then one before with lvl 2000.
I hope this will help.
Jinto