Regarding Ethereum, not sure why it doesn't increase much until now. People start to feel disappointed with Ethereum performance. Since it is the number 1 altcoin, it should lead the increase of all altcoins. Unfortunately, it seems having difficulty to increase consistently.
Retail investors are far more interested in memes than in coins that are established and have proven themselves over time. Even Bitcoin has not really seen a significant increase in adoption, as we can see from the nearly empty mempool. The bull run has been driven almost entirely by institutional demand.
Altcoins are also in a bull run if we think about how many memecoins have been getting pumped. These coins are designed solely to transfer wealth from the bottom to the top and, as a result, die out quickly when creators cash out by dumping a large percentage of the supply.
With Trump in office, many people were optimistic that his policies would have a favorable impact on the overall market, but the launch of his own pump and dump memecoin and tariffs on the U.S.’s largest trading partners have diverted liquidity away from major altcoins and kept prices depressed.