Great post op! I definitely regretted selling some of my stash which was around half of its value sometime back though it's alright since I didn't really lose anything and just missed out on bigger profit.
I feel for the people who sold their BTC when it was far lower in value many years ago honestly speaking.
I completly understand you, my case it is very similar. But you know what!
WE still have time to correct our old mistakes by HODLing !!!