How do I not run out of diamonds and coins fast?

My biggest tip is to try and use rewarded items that you recieve for free as rewards for winning challenges and season pass. Only buy new items if they're required in the specific challenge, otherwise, try and use as much of your owned items as possible to save gems and coins. Also, you can vote for looks and if you're really short on money i suggest you watch ads after voting to get some extra gens. Try to submit a look in the daily challenge every day and only use owned items with "no value" since there is no required "points/value" in the daily challenges. if you're happy with a look but still need to fill up the point/value meter more, try and look for cheap options to add/buy, like legwear which goes for around 100-200 coins/gems. Don't overspend the gems or coins. Try to submit as many looks as possible as often as possible to max the amout of rewards you get once the results come in, that way you'll spend basicially all your money on the majority of the availiable challenges each day but check in the next day to get the rewards for the look and you'll probably make up for the loss the previous day. It's kinda momentum based. Also, try to log in and submit atleast 1 challenges every 24 hours to keep the streak going and you'll recieve rewards for just keeping up the streak aswell! 😃