Holding bitcoin by making investment at an early phase is best you can do and then simply wait for some time nothing else.The Winklevoss twins got $65 million compensation from Mark Zuckerberg and invested in bitcoin and now see they both are at $3 billion each launching Gemini and being visionary.They said "bitcoin is not going to be dead and will stay here for long" and now see those who advised them are trying to get bitcoin while they have already made networth out of it.So by the end of 2021 if we see $100k or even $80k around then in 2025 the expected prices will be 2-3x more taking them above $200k and golden crossover for many times.Market cap is increasing at Faster pace with institutional and retail investment and could cross $1.5 trillion within a year with more adoption so holding even 1BTC would be enough also.But it will be best if you try to accumulate more of them.