I also have the same thoughts as you, there are only regrets .. why didn't I buy bitcoin in March. even though at that time I had a lot of money. I should be able to smile broadly by now
Regret is the only thing we can feel right now but we should take this as a lesson in the future and could be our motivation that next time we should learn to take any chances to buy bitcoin when it dips, as of now may speculations that when CNY happens every year bitcoin fluctuates, so I think it might be a good signal for us to buy some on Friday, just study the chart and join the group in telegram and reddit for some insights and tips.
You need to build that confidence starting with finding the right information in tracking the movements, afterwards
those regrets will be replaced by desire to succeed.
Instead of thinking of anything, try to encourage yourself not to lose another momentum, start trusting your guts
and start working for your success.