I have an advice for those still in deep regret of selling of there Bitcoin in 2013 - 2015 and those who saw the opportunity to invest in Bitcoin years back and refused to invest I was there before and it affected me negatively.
Don't bring up the past, let the past become your own memories. In the future, just focus on bitcoin by accumulating using DCA. live a new chapter in your investment journey because as long as you have the intention to change your fate then you have a greater chance of achieving success in the future.
I also started last year by buying bitcoin every week with the intention of never selling it again and having the confidence to hold it until old age or for my retirement. If you have more money, keep buying aggressively and if you don't have money, don't take out a loan to buy bitcoin. Invest casually without having to force yourself to continue buying aggressively but just focus on DCA.