I had Ethereum and Monero, and there's no transactions showing at all.
I'm thinking the phrase was correct because I can see my bitcoin transaction history?
I tried to check, and it seems that the Ethereum server in my Coinomi wallet is down, the same as Monero I've tried to open my Coinomi wallet, and the coin icon shows red look at the image below
According to Coinomi support red dot means no connection so possible the server/nodes for Ethereum and other coins are dead.
You don't have any other choice but to switch to other wallets that support these coins Ethereum and Monero. To be able to move to another wallet you need to extract the private key from your backup seed phrase you can use
https://iancoleman.io/bip39/ as I suggested above and import the private key to another wallet like metamask.
Check this guide on
how to export the private key from Coinomi.
For importing private key to Metamask follow this "
How to Import Ethereum using a private key"
Take note for safety purposes you can run the BIP39 tool offline to avoid online vulnerabilities.
Once you imported the private keys to other wallets I suggest transfer your funds again to a new wallet with a new backup seed phrase.