In my opinion, you should make your own decision whether to quit playing slots because it depends on what your goals are. Losing is a natural outcome of a gambling session, so it can not be a driver for a decision. The only thing I would advise you is to learn to limit your deposit and end the gambling session after you have increased your bankroll by 20-30%. In this case you would lose much less, or even win if you exit in time.
I support you because seeking for the opinions of others for something that does not concern them is not always the best idea, you will only get bad advice when you ask because they will be giving you advice based on what they feel and it has nothing to do with what you feel. In this situation, you are the one losing therefore if you do not find success with slot games you have to stop playing them and try to play other games until you find a new game that you can win. There are many games you can play when gambling therefore your options should not be limited to just slot games. You might like it but what is not giving you success should not be continued unless you are just gambling for fun but that is not what is happened as you would not be complained if OP was just gambling for fun.