Have you ever watched him speak? He's very honest and clear about his motivations and concerns.
For example he was very clear on what it would take to get
his endorsement for the presidential election - 10 year immigration moratorium, and no war with Iran. Trump refused to even acknowledge these concerns so he didn't get the endorsement, simple as.
These issues are incredibly important for the long-term prospects of white Americans and totally ignored by Trump. The former because legal immigration at the current levels will result in whites becoming a minority in the US in 18 years, and this is likely to accelerate as Trump and Musk are heavily in favour of high legal immigration. The negative effects of this and mass immigration suppressing wages, leading to more expensive housing, the negative effects of high ethnic diversity, etc make it an important issue.
The latter because America has been under ZOG control for a long time and still will be under Trump, so more American lives will be lost to fighting Israel's opponents in the Middle-East. Whilst actions like designating AIPAC a foreign entity, firing Zionist government employees, etc will also do great harm to ZOG's agenda the highest impact single action will be to stop fighting Israel's wars.
On election night he was getting >70k viewers on his Rumble livestream, more than virtually anyone else except Steven Crowder, and this is as a one-man show. He's addressing issues than nobody else is, and as long as he continues to do so will retain his huge popularity amongst the right-wing.