Of the people I spoke to, they were there for many different reasons.

Some fear the loss of Democracy, many feel Trump is "power grabbing all he can and bypassing Congress.
.the tariffs were a huge concern..some fear we are loosing many rights such as voting, freedom to choose, gay and LGBQ

and I think almost all want DOGE and Musk gone.

You are correct, there will be much more to come as long as Trump and Maga are in power.