There are several key factors that could contribute to the forecast of Ethereum (ETH) reaching a price of 25,000 USD by 2030 according to cycle forecasts and blockchain development.

Development of DeFi and DApps: Ethereum is the primary platform for decentralized finance (DeFi) applications and decentralized applications (DApps). The growth of these sectors could drive demand for ETH, thereby increasing its value.

Technological improvements: Major updates like Ethereum 2.0, with the transition from Proof of Work (PoW) to Proof of Stake (PoS), help enhance the performance and security of the network while reducing transaction costs.

Widespread adoption: The broader acceptance of Ethereum across various industries, including finance, real estate, and digital art (NFTs), could increase the value of ETH.

Increased regulation and legalization: The legalization and clearer regulations regarding cryptocurrencies could create a safer investment environment, attracting more institutional and individual investors into the ETH market.

Network effect: As the number of users and developers on the Ethereum network increases, the value of the network and the ETH token also rises.