Hello,
Can Anyone advise what is the best way to buy bitcoin in bulk (more than 20), due to the limitation of all exchanges and Payment Gateways
Thanks in advance
I have always heard that whales or institutional investors never buy bitcoin from exchanges. They buy it Over the counters. I have never experienced how it is done, but you can search for the term "Over the counter" and buy bitcoins from there.
Binance also offer the OTC services. You can check them too.
Yes there are whales that are into P2P, some over the counter but some just purchase it in exchanges like Coindeal and Binance. LocalBitcoins is also popular but may vary from places to places.
It seems that op is preparing for the coming bitcoin halving.