*I used to have a car back when I was young, but then I got my driver’s license revoked, and just started taking taxis, so I GOT OUT OF THE HABIT OF DRIVING almost forgot how to drive altogether.

А кроме get еще какие-нибудь глаголы можно использовать в этой конструкции (fall, например)?

А get rusty еще

My Italian is a bit rusty these days.

get out of practice(?)

RUSTY implies that you can still do something relatively well, but not as well as before, and you'll need very little time to get back to your former proficiency. It's mostly used in reference to language proficiency, but not exclusively.

FALL INTO DISUSE is also a possibility, although this is most often used in reference to things left abandoned after people stop using them.