How to move your base near to your alliance?

If it is the first alliance you have joined then you may get an alliance teleport item once you have been invited. Using this item will move you near to the alliance leader. You don't get to chose the location yourself the game will decide.

If not then you must use an advanced teleport item to move to a spot of your choice. You can get these as rewards for some events of buy them in the store for 2000 diamonds.

Find your alliance leader or a location where your alliance is concentrated on the world map, or ask for co-ordinates to be posted in chat. Go to the location on the map and tap a spot you want to move to and select 'Teleport'