You have to be taking the actions you want members to take.
That means you.
If you want members to ask questions, reply to each other, welcome newcomers, share content, advocate, then at the very minimum you need to be taking those actions.
Even better you should have relationships with a few others who will also take the same actions. You might be surprised just how few people you need to engage in a behaviour for it to spread.
But if you’re not taking the action, neither will your closest colleagues/friends. If your closest colleagues/friends don’t do it, neither will anyone else.
And if you find taking that action feels forced, boring, or ‘like work‘, you might want to tell your members to do something else.