level freeze didn't effected that much, if your server has been merged more than 2x.not worth for freezing just to get a few resources while not getting other stuffs.u are only holding back your own BP grow and vs under BP and LV is quite lame that are not most likely since even mid spender like to stay on lv 80s. so overall in my humble opinion its not worthed. best way f2p is go forwards ignore all the noises. works with all u got.

cpns quite handy for BP. on any good events like lucky board or clothings, and such. but at some point you will not needed stuff like medium refine and such anymore, there for events like lucky board is not for you anymore. if that's the case than its better aiming some good unit/s.