What's your current plan?
To simply continue to accumulate Bitcoin.
Your story is reminiscent of the person who could have bought a winning lottery ticket but didn't, or changed the combination at the last minute. Fortunately, in the future I won't have stories to tell like yours.
First and foremost, your experience is not an isolated case. The history of Bitcoin is replete with regrets and missed or wasted opportunities.
That's what happens with an asset that has given such a return as Bitcoin. There were many people who knew about Bitcoin when it was worth very little, who had the opportunity to buy and didn't, or bought and for some reason or another sold, and now think about how much of a multi-millionaire they would have been if they hadn't done so.
I think that better than regretting the past is to look to the future and not make the same mistake. The best day to buy Bitcoin is today. It still has a lot of profitability left to give.