Bridge routes can be unavailable due to a variety of reasons. One of the major reasons for this issue can be this:
A route for this transfer simply does not exist currently on our Bridge Provider's end. This can especially be the case if you're trying to bridge a token with relatively low trading volumes.
We are working hard with Bridge Providers on integrating more bridges to make the process smoother.
Here is what you can try:
Swap the token for a token with relatively high trading volumes. Some of the more popular tokens are: USDC, DAI, ETH, etc.
Make the bridge transaction to the destination chain of your choice.
Once the tokens have been shifted to another chain, swap them back to the original tokens of your choice.
Disclaimer: Since this process requires multiple transactions, it can prove to be expensive in terms of gas costs. The process also has multiple points of failure & hence is not a sure-shot solution.