Assuming you are on windows.
Go to windows > run and type
%appdata% hit enter and navigate to
electrum folder and make sure to make backup copy our
wallet.dat file to multiple places.
Also, from existing electrum do an export of private keys if it allows you to. I hope you remember your seed/wallet password.
Download the latest electrum from electrum site and install it then click on import (if it doesn't pick up the wallet) and you should be good to go.
If you have any questions, post them here. I am not sure about mobile wallet and i would stay away from them especially on google play store due to so much spamware on it.
electrum site:
https://electrum.org/#homemake sure your PC doesn't have any malware so do a scan with antivirus etc. Learn how to send transactions using Air Gap pcs. If you have large amount then get Trezor or Nano Ledger S