You can't... the only way to consolidate inputs is to send them all in a transaction to yourself... so that you end up with 1 big giant input... that way, when you send future transactions, you'll be at minimum size. The problem with consolidation transaction is that you'll still end up needing to see one large transaction (and get hit with large fees)
To get around this, I'd suggest you import your Mycelium seed into a desktop version of Electrum... and then you can use manual fees to do a consolidation transaction that sends ALL your coins back to one of your Mycelium addresses with a low fee (minimum of 10.1 sats/byte)... then use ViaBTC TX Accelerator to push the transaction to get it confirmed.
You probably want to wait until the network is a little less congested tho... ViaBTC TX is very popular because fees got expensive again... and there are like 30K+ transactions unconfirmed.
To get around this, I'd suggest you import your Mycelium seed into a desktop version of Electrum... and then you can use manual fees to do a consolidation transaction that sends ALL your coins back to one of your Mycelium addresses with a low fee (minimum of 10.1 sats/byte)... then use ViaBTC TX Accelerator to push the transaction to get it confirmed.
You probably want to wait until the network is a little less congested tho... ViaBTC TX is very popular because fees got expensive again... and there are like 30K+ transactions unconfirmed.