during the period from 2012 to 2016 I went through a difficult period in my life and I forgot that I had bought bitcoin it was since the year 2021 that I remembered everything and I do my better to recover my bitcoins
Don't judge a person without knowing their story first.
If this claim is true (of course this is from our perspective and not yours) then how you'd be so sure if the one who bought your laptop is still living or the laptop itself is still usable? Too hard to move on if you're hoping but if the buyer isn't anymore as well in this forum who recovered that wallet.dat file on his own then your chance of getting it is slim. Price of Bitcoin has gone parabolic and I doubt if the buyer will return it on you again, 90% chance you won't get it.