Hi guys, if we migrate

1) my car still at Malaysia, want to keep it coz I will go back frequently and drive. What should I do ？ do I need to go jpj change ownership ? But still consider same person right ? No charges ? And next time to renew insurance and road tax, any problem ?

2) next time I take flight back to singapore, can I claim for tax refund for my purchases ?

3) I do not own any other asset apart from the car, any other thing I should take care of after I got the new citizenship ? In term of finances or banking issue? I do have a bank account and quite a lot of credit card in Malaysia ....

Please advice. Thanks.