How to increase by 2 lvl, how much should you play games for?

imagine you would level up by "playing", people would run idling programs 24/7

https://www.steamgifts.com/about/faq
read about contributor value

1. Giveaway more games
2. Play your games for however much you want, would be nice if you play all wins to completion... but that's not a real expectation outside of a few groups here.

There is no requirement to play on SG... but then whats the point of winning a game if not to play?

My opinion on playing games is to ignore Steam achievements and all other steam gimmicks.
Beat the games as best you can, for some it means fulfilling the stories. For others it might mean exploring every area, lore in the game. Not a fan of the idea of 'completing' games. You are volunteering to an artificial grind just to see a meaningless number at the cost of your time.

Its like running a race even if you have already crossed the finish line.... But some people get a high from seeing that number, good for them ig🙉

You need to reach Contributor value of about 25-50 $
Basically for you I would say find a game that costs 30 $ and is on 90% sale (costing 3$). :)
And also don't forget that it should not been bundled before... (This is the hard part...)