You can definitely improve footdrop with exercise - I have 😅😀. The main ones being:

Wriggle your toes - scrunching them up, spreading them apart

You can do this sitting down or standing - keep your heel on the ground and raise your foot up. Complete 3 lots of 10.

Similar to above, with a theraband place it around your foot and place the remainder of the band under your other foot holding it down. Then raise your foot keeping your heel on the ground. Again complete 3 lots of 10.

I also do exercises that strengthens my hamstring and glutes. I no longer need a walker, I walk up flights of stairs etc.

There is a lot we can do . I am also on Gilenya and follow the ‘Overcoming multiple sclerosis’ lifestyle 🍓😅🍏💪🥦

Twice a day when I sit down to brush my teeth (stool chair in my bathroom) I extend & flex my right foot to the count of four (my electric toothbrush goes 30 seconds per area of my mouth) & then do the same with my left foot. My physical therapist explained that that muscle group is what I needed to strengthen to address my foot drop...I figure the routine I’ve put together means that the muscle group is strengthened with a 60 second. I’ve been doing that for about 3 years and it has TOTALLY meant that my daily 1 mile walk isn’t impacted with foot drop

Try Trevor Wicken's The MS Gym. IT IS AWESOME! L ook at it on YouTube.

Ossur Foot up, it is a light lifting device for $50 on amazon. My rehab hospital told me about it.

I use compression socks and it helps my drop foot and spacticity