My strategies for slots are as follows one specific slot per casino and play the deposit bonus and bonus offers when available as well as my own deposits until I score a big win. On one site I have Book of Dead and I have been playing the hell out of it literally went over 1500 spins no bonus then finally it came in and it was crappy Kings and guess what? Not even one expansion lol. Never playing this crap again because I have to raise my stakes too high to balance my losses and I cannot sustain a run like that again. I asked for my RTP the casino sent me this back.
Thank you for your further correspondence.
Your current RTP for the game Book of Dead is 57.2%
That is bloody ridiculous over thousands of spins