[How to utilize opportunities in Bitcoin] sounds like a guide whereas it's not.
BTW, sometimes people can hold life changing information yet not make use of it based on circumstances. sometimes issues that are very important to our life prevent us from taking an opportunity, for this reason I don't blame anyone who misses the opportunity because one must be alive to see an opportunity but for cases where people reluctantly refuse to partake in anything for some selfish reasons its to their disadvantage because as you said opportunities come but ones.
But critically thinking opportunities does not come once but a {particular} opportunity may not come twice. If we try to analyze the argument above you will agree to this rational thinking, let's buttress using Bitcoin as an example you can miss buying Bitcoin today yet still have an opportunity to buy it again let on. But the difference is it may not be the same price again.
Using life generally as example if opportunity come but once most people would have not made it in life because they missed the first opportunity but the fact is you can miss and opportunity for a particular tine but still have another opportunity to succeed.
So opportunities does not come but once rather a particular opportunity come but once.
On a real sense, many missed the opportunity of buying Bitcoin for cents till the price climbed before they acknowledge to begin accumulating and they bought at a price higher than cents because they missed the first opportunity but still buying at the higher price will still give them good profits.
A person can miss an opportunity not because he wants to but due to certain circumstances which may arise at that point but their might still be an outbreak of another opportunity.