With the new statement of Splinterlands, your last rank will be your equal chest at the end of the season. For example, if you are able to reach up to Gold II but your card rental expired prior to the end of the season and your card power is up until Bronze II, you will only get 7 loot chests instead of 26 loot chests.
In order for you to avoid such hassle, I suggest you make sure that you have extended time for your card rentals beyond the end of the season as well as maintaining your battle points.
That is just my update for now, I hope you send this to all your friends playing Splinterlands to avoid rank dropping. Tag and share with your friends to keep them updated. Stay safe and game on!