Should I switch to dbs multiplier from cimb ?

Why not? What's stopping you?

If you can hit dbs multiplier requirement, why not? But do remember that most account high interest are only applicable to a certain amount. If you hit DBS multiplier maximum amount, you can move some to CIMB. You can also consider other high interest savings account if you can hit their requirements.

https://seedly.sg/tools/savings-account-calculator