Is jumping credit cards for their bonuses wrong? Will it affect my credit score in the long run? And if so, how do I increase it back?

I had signed up mutiple cards over the last 3 years to take advantage of the sign up bonus. And each time, I downloaded my credit score. Nothing happened and I remain in AA.

Additonal info: I still have multiple installment payment over these 3 years and I also pay my outstanding credit card statements on time.

I believe the key point here is to always pay your outstanding credit card bills on time. As long as you do so, your credit score will not be affected.

There is no right or wrong... but the thing is unless you are really a big spender , you can’t possibly use all the cards.
( i use credit card like debit cards)

As Long as you paid up on time, it won’t affect.