Cheating is always going to be an issue. Please don’t create fake votes, there’s a good chance you will get caught, and you entry will get disqualified. Especially in larger jams, we’re looking more closely at the activity of the voters.
If you have the time to cheat then you also probably have the time to rate games correctly. You don’t need to rate hundreds of games to score well, put in a genuine effort and others will discover your project organically through the entries page & comments.
Or don’t, there’s nothing that says you have to vote on entries. Skip voting if you don’t have time and feel accomplished that you were able to submit. I just feel it’s hard to balance your need of wanting your game to get high visibility in the rankings while not wanting to contribute back, especially when you have so many others investing a lot of energy in doing the work on rating and leaving comments on entries.
I’m sorry you had a bad experience, but that’s not justification to redo the entire ranking and affect the thousands of other participants. A lot of thought was put into how this system works, as I’ve tried to explain here. I understand that it can be sad to see your project not rank where you hoped, but this is user-contributed voting system, so the participants will need to participate.