Democrats have won 7/8 of the last presidential elections by popular vote, and have nominated 3/9 current supreme court justices. But yes, you should be concerned about the left's hijacking of the court.
The electoral college was made up like a bajillion years ago as was the setup for the Supreme Court.
You can argue the rules are stupid and want them changed, but this wasn't some modern scheme created the other day.
The filibuster, Supreme Court hijacking, and this new Republican nonsense are all people trying to steal power. Of course there's gerrymandering too which is an ageless tradition for both