You could turn it instantly into 100,000 HP if you were willing to convert enough crypto to hive and then power it up but that costs money.

It is possible you could get that posting, voting, etc. It is just a matter how long it will take.

Also the whales will also have grown at likely a faster rate during that time so 100,000 HP may no longer be as powerful as you might hope.

It is hard to say. There is no way to catch up to the most powerful whales without spending money to do so.