You want to have "parallel construction" This means that you should use the same word form throughout. For example,
I like to eat, to dance, and sleeping. This is NOT correct
I like to eat, to dance, and to sleep. This is correct
I would suggest changing everything to subject + verb
Accessibility to a vast variety of things from your room
would become:
you can access (or you have access)
time-saving activity becomes - you save time.
sellers are not restricted -- this sentence is good.
scams becomes -- there are a lot of scams, you might get involved in a scam, etc.
Most (not mostly) products -- good sentence
• Time-saving activity
• Sellers are not restricted to an area, they have a lot of costumers from around the world
On the other hand there are a lot of cons of online shopping like
• Scams
• Mostly online products are very expensive
• You can't physically check the products which is very necessary for some products like perfumes.