What exists to stop SCOTUS from being as subjective as they like? They could theoretically being impeached by congress, but how could that happen if the majorit

What exists to stop SCOTUS from being as subjective as they like? They could theoretically being impeached by congress, but how could that happen if the majority of the congress share and supports the subjective interpretations of those judges? And what if those interpretations, like rulings on gerrymandering and rules around voting, then further ensure congress maintains that majority? Your belief of limiting SCOTUS is good, but the reality is they have no limits. They could literally make any interpretation as wild as they want and as long as the interpretation aligns with even the slimmest majority of the house, it stands as the law of the land.