If you sold your BTC in July, now you can buy them back with around 20% profit.
Nobody can say why you sold your bitcoin because it depends upon your needs. Nobody knows your personal problems and situations. You just told that you sold all your bitcoin but you didnt mention the reason for that. If you would mention the reason for selling your coins, then we can give our comments in the right way. Now what we can say about this?
You should not give up you should try again and again until your last breath. Bitcoin is the plat form where no one can lost money.