Below is a link to my previous post:
https://bitcointalksearch.org/topic/m.55985225
it is not a mistake but a very appropriate action to buy bitcoin, now that you have made a profit I think you did not make a mistake. If you buy a very large amount of bitcoin when the price of bitcoin is $ 12k then now you have got a lot of profit because the price of bitcoin has reached $ 55k.
at this point you can sell some of your bitcoin to be used as business capital or to buy your favorite house and car, congratulations for having fun.