A few strategies come to mind. 1: watch hive-engine like a hawk for fluctuations in DEC, SPS, Chaos packs, etc. and to snatch them up for cheap when possible as if you notice on your SPS Management page on Splinterlands Airdrop points come from many different options and not just cards. 2: obviously accumulate the best collection of cards you can as that'll obviously give more rewards. 3: rent out cards on peakmonsters and use added DEC to enlarge collection overtime or to just hold DEC as that'll also increase rewards.