Yes, it's really good to see those who believed in Bitcoin during its worse are getting the rewards in the form of bullrun, it's not an easy task to hold on when the market goes through Bitcoin bloodbath. But I feel sad for those investors who invested when Bitcoin was at ATH and then sold it incurring loss due to high emotions and panic which loomed over crypto market in 2018.
I did hold throughout all this blood bath and I turned out to be a winner in the end 
You can never catch ATH or ATL, as long as you're in profit whenever you cash out doesn't matter, win is a win and I feel happy about it. BTC has so much potential that 20k is nothing for this cryptocurrency.