Hello,
You can start by organising your own race for CC. Organise a team of 6 people and queue up. Seeing this, i think the opposing race will get in queue with a team of 6 people. Of course, this method will take some time.
If you want to progress faster, i suggest that after completing the first 2 quests for the UK at those lvl(3-4), it will be possible to complete the remaining quests in CC-386 after lvl5.
Here I will share the quests that can and cannot be completed in CC-386 for you.
First Quest - Mining Green Crystals - Possible to complete in the CC-386
Second Quest - An important loss - Not possible to complete in the CC-386
Third Quest - Mining red and blue crystals - Possible to complete in the CC-386
Fourth Quest - Initiation into the Underground Knights - Possible to complete in the CC-386
The above quests are a chain and as you complete them you will be able to move on to the next one. Since it will not be possible to complete the 2nd quest at CC-386. I strongly recommend completing the first and second quests at 3-4lvl.