[HELP] Reaching Silver Tier

Hi, I've been playing Splinterlands since April.
I've been inactive for such time and now I want to be more competitive.
My issue is that what would be the best rentals for such low budget players to possibly earn enough to re-rent and keep my tier going up to Silver.

Currently I'm still on bronze tier.
I'm hesitant to rent because I'm afraid on not be able to get it back at the end of the day. In bronze 3 it's impossible to gain anything so as much as I can I'm trying to reach Bronze 2 before renting to also have enough power to level up to Bronze 2.

I was thinking maybe renting a Kron but that would cost around 60DEC per day and in Bronze 2 I think that is impossible to get ROI.

Looking forward to get some help from you guys. I don't wish to earn alot.
I just want to enjoy a higher tier without pumping too much credits on the game.