Some sellers get the offer, many don't.
There is nothing you can do to get the offers. You haven't sold for a long time. Reactivating your account by listing some items may prompt Ebay to send you an offer - equally, it may not.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)