2nd Engineer Unlimited

I’m looking into upgradeing my Unlimited 3rd Steam, Motor, Gas Turbine to Unlimited 2nd Steam, Motor, Gas Turbine. I’m getting ready to send my package in, but I might be cutting it close with my GT time. Want to make sure I’m not wasting time and money.

135 days credible steam, 144 credible diesel, 120 total GT with only 90 credible because of an ROS. 369 credible days, 399 total. Any guidence would be appriciated.