Well, because the GOP don't actually reduce spending, balance the budget or any of those important spending/debt promises, the democrats will always regain the majority.
If the republican voters would stop electing RINO's like Trump & Mike Johnson, the GOP could return to it's conservative roots. And the democrat would most likely never have the majority ever again.
But as long as those RINO's keep caving to the left, spending well beyond their means, it's inevitable that they'll lose their majority within 2 to 4 years. Just like clockwork.