Although some people might think it’s a bit regrettable to sell Bitcoin at this time, for me personally, since a house is a primary need for me now, I consider this decision to be the right.
I did the same thing when bitcoin was roughly $2k-$3k and I have zero regrets about it. So don't worry, just keep accumulating more bitcoin for the future and enjoy your new home.
It is okay to sell at any time convenient for the owner especially if they are selling for the right reason such as this which has to do with buying a house of our own it's another form of investment altogether with shelter. There are good opportunities that might never come out way twice, and when we have a means to seize it we should do so. At whatever price we sell our bitcoin holdings there shouldn't be any regrets if it served the right purpose because most definitely there's large room for another accumulation journey again.