In mid-December 2020, I put ~10% of my total investment funds into four different Bitcoin vehicles. I didn't just buy and hold them all, I have traded some based on chart signals.
Actual Bitcoin, bought and sold using Paypal (really slick actually), and using trading signals from this chart. https://schrts.co/CgPWdfec
This 10% has now grown to be ~20% of my total investment funds. When it grows to be ~25% (next month?), I plan to start selling some of it and putting the funds elsewhere, and to maintain a ~25% position in bitcoin going forward. I believe bitcoin is a once in a lifetime event.
If I were starting a position now, I would consider a different miner stock. You may want to consider it yourself.