A level ten player facing a level twelve player starts the match at a massive mathematical disadvantage before a single card is even played.

Many players inadvertently stall their base progression by hoarding resources or ignoring the social systems of the game.
The Primary Source: Upgrading Cards
Every time you spend gold to increase a card’s level, you are rewarded with a burst of experience points.

Conversely, upgrading a card to the absolute maximum level costs massive amounts of gold for a relatively small XP return.
Upgrade your main deck first, always.The cost is microscopic, but the XP bump is significant.Do not upgrade useless cards to high levels just for XP. The Guild Economy
The second most consistent way to generate base experience is by actively donating cards to your clanmates.

This is why joining an active clan of fifty people who constantly request cards is absolutely mandatory for free-to-play users.
Donation TypeExperience GainedCommon CardsConsistent, reliable progressionValuable TroopsLarge burst of XP, but highly limited in how many you can give Why Tower Health Matters
If your king tower was one level higher, it would possess several hundred more hitpoints, turning that loss into a win.

A higher level tower might kill a goblin in two shots instead of three, preventing thousands of points of chip damage over a match.

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