dollar cost average. buy same amount every week. Also, hold your bitcoins locally. Online wallets and exchanges can and have disappeared, been hacked, etc.
Thank you for your feedback, but:
NO. DO NOT "DOLLAR COST AVERAGE", SINCE IT LEADS TO A MARKEDLY WORSE RESULT IN EVERY SCENARIO WHERE BITCOIN CONTINUES APPRECIATING AGAINST THE DOLLAR AS HAS ALWAYS BEEN THE CASE SO FAR.Other points are correct.