Before installing the save file, you must have a second profile created in the game. If you already do have one, consider backing up the files (if you still need the saved profile, of course) in the following path:
%steamRoot% / userdata / %userID% / 321040 / remote
Their names start with "savegame@profile1#". They will be overwritten by the shared save files.

Path details:

• %steamRoot% default is C: / Program Files (x86) / Steam (for Windows)
  
• %userID% is the ID of your Steam account for Steam Cloud. Be cautious if you have accessed more than one Steam account on one PC, there may be several directories with different IDs.

Save files: https://drive.google.com/file/d/1dr6XWy1IY0jSHOOJnjxwt9w9oT4Iq4Uy/view?usp=sharing

Extract the archive in the same directory: %steamRoot% / userdata / %userID% / 321040 / remote.

Run the game, enter multiplayer, end a race (or two, not sure, I don't think you can learn how much XP do you have in numbers) and then your level should increase to 35 in no time.