I also observe that playing the same kind of slots for a longer period of time won't give a good win instead, it will give you many dead spins and there is a huge chance of not getting anything if you hit a bonus round.
I observed that online slots games tend to provide fewer wins when compared to offline slots for some weird reason which is why my strategy with online slots is yolo from the start itself for short-term gains.
This worked more often than not for me which prevents me from playing for a long time since I bust my bankroll quickly or end up earning big profits.