The golden opportunity is over but I would be surprised if there are not more good opportunities. Bitcoin right now is around 16k and it won't be a smooth ride on the way back up to the previous ATH just below 20k. If bitcoin drops to 14k or so again it's a good buying opportunity.
The opportunity to make a lot of money with bitcoin is over as the price has risen a lot,now we have to check and look for opportunity in the alt coin market to make a fortune ,but if you have the capacity to hold bitcoin get in and hold for a long time,who knows what the price would be five to ten years from now.