OP, I understand your plight but let us not be blinded by the love for Bitcoin. The advert may not go down well with you, but it's still cautious advice that is not peculiar to Bitcoin investment alone but all other investments as well, and above all, it doesn't hurt in a way. We all have to be careful with all investments no matter what we believe in them or hope for about them. Come to think of it, if you are sincere enough, more time is still needed with Bitcoin, it's still very young and still withstanding the test of time, which is why we still need to give it time and continue to study it.
Also, the 15 years you called is way too little for an asset to be entirely trusted whether you like it or not, what about those assets that have spent centuries and millenniums, can you compare them in a time-tested trusted level if you are sincere? Bitcoin is popular, well-appreciated and celebrated because it was introduced in this digital age, we should now be patient with it.
It has not even celebrated the silver jubilee yet, not to mention the golden jubilee and 100 years. And don't be surprised that the person who wrote that remark may be a Bitcoin lover and holder as well, but may also be a true investor who does not want the love of it to cloud his sincere judgement. This is the wisest approach in the investment environment if I'm asked.