I'd suggest only renting the power required for silver 3 and see if there are any expensive cards that you are currently renting that you can live without. It sounds like your rental costs are high so I'd focus on reducing those costs without sacrificing the silver league rewards. With a little work on cost reduction I think you'll be able to start turning a profit.
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Do you have any card in mind for example because all the low price cards are usually 1000 or 1500 power and around 13-100DEC so i have to rwnt like seven of those oto rank upto silver 3
I usually just grab whatever the highest CP/DEC cards are that are available on the market, which you can view on PeakMonsters. I've been able to consistently rent cards for around 300-400 CP/DEC and every once in a while get lucky with a better deal. But even at 300 CP/DEC, you're only looking at 50 DEC/day to rent the 15k power needed for silver 3.
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I want to learn this