There is a great idea for implementation in the cryptosphere, but I am a beginner developer and I do not have enough funds to afford the creation of a token on ETH. (unjustifiably large commissions with a high price of the Ethereum itself)
Is there some kind of cross-blockchain to implement my ideas with very low fees?

if you have the funds a little better look for a safe alternative and don't be too forced to implement in a cryptosphere you don't really understand. you better take a step back than be forced and lose your funds. there are many ways you can implement it in the cryptosphere but make sure the skills first and sufficient funds.