I believe it's belong to Bitcoin discussion https://bitcointalk.org/index.php?board=1.0 or https://bitcointalk.org/index.php?board=6.0
If you want to hire some experienced people to trace your bitcoins, post a thread to share at least BTC5-BTC10 as the reward for everyone who can do it for you https://bitcointalk.org/index.php?board=52.0
It's strange as Ledger wallet should be safe, where did you bought it?
Second; I left my PC with Electrum open, are you sure no one using your PC right after you left it? I often do the same thing, but my bitcoin remain safe in electrum wallet.