Frontier Format in Splinterlands: How do I reconnect with Foundation Cards battle ranking?

How are you doing, my friends?

It has been a long time since I played the Frontier format battle ranking games. I was too busy playing in Modern and wild format that forgot about my collection of cards from the Foundation series.
I came back after four seasons, I believe that I could get my team out of the bronze league with no real resistance from the opponents.

Furthermore, I was wrong because the experience of the players in Frontier format has increased significantly since the last time I was playing around in this format.

A:/ Deep Look at my collection

It gets worst when the rule sets force me to play with only a certain type of fighters in the arena for a specific battle.
I was in a great need of additional warriors in my collection. I was not in possession of great resources to buy my cards but I could rent cards and level up some cards with the rewards from my performance.

I think that it is possible to fight my way out of Bronze with the limited cards in my collection. The problem will be way out of control when I reach Silver, up part of the ranking level.
It is the lack of practice in the lower league that causes my terrible performance in the arena.
If there is simple advice to give to new players or veteran who left the game for a long period of time, then return with a conflict about the win rate. There are better way to improve your performance than purchasing new cards.

C:/ How to achieve my goals