YOU SAID:

im going to walk slightly fast to my local store

INTO JAPANESE

私は私の地元の店に少し速く歩くつもりです

BACK INTO ENGLISH

I'm going to walk a little faster to my local store

INTO JAPANESE

私は私の地元の店にもう少し速く歩くつもりです

BACK INTO ENGLISH

I'm going to walk a little faster to my local store