How do I level up?

Games with 2 ** give nothing in return when it comes to CV, as they were made free somewhere, this is to stop people from abusing free CV boosts.

Games with 1 * is bundled games gone for over 90% off, and well games on steam that have gone over 90% on sale too.

Games with nothing, means they are full value.

You'll get CV for the ones that have no asterisk or the ones with only one asterisk *, which in turn give 15% of usual CV. The usual CV is 1 for each dollar the game sells for at base price up to 50 CV for a $50 game. Games which sell for more then $50 are still capped at 50CV here, e.g. $70 game with full value with no asterisks next to it will still be 50 CV towards your level. A game which would normally grant 50 CV that has been set to reduced value will receive 7.5 CV, 50 CV X 0.15 % = 7.5 CV.

"What are "No Value", "Reduced Value", and "Full Value" giveaways? How do they affect my overall contributor value?
When creating a giveaway and selecting a game, you'll notice "No Value" games are marked with a double asterisk, and "Reduced Value" games with a single asterisk. If you hover over those icons, you'll see the effective date for the value adjustments. For example, if a game is marked with a single asterisk, and hovering the icon shows "Reduced value since January 4, 2018", this would mean giveaways created for that game on January 4, 2018 or later will receive reduced contributor value. Games typically receive no value or reduced value when they're featured in bundles, heavily discounted, or available for free in online promotions. Their values are adjusted this way to better represent their true value. Keep in mind, the asterisk icons are just for reference, and the value of a game can be backdated if we need to make retroactive changes.
Games fall into one of the below three categories.

No Value:
No contributor value when given away after the effective date.

Reduced Value
15% contributor value when given away after the effective date.

Full Value
100% contributor value when given away."

https://www.steamgifts.com/about/faq