What activities can you recommend for toddlers so they won't get bored just watching TV/Youtube and playing their usual toys?

oh, don't let them have too much screen time. Crafts like finger painting, vegetables/leaves imprints using paints, outdoor trips to garden or playground to explore nature (point out to birds, squirrels, butterflies, grasshoppers etc) to teach them about animals, colours and shapes... the list goes on :) Have fun!