Here are my two pieces of advice.
First you will never feel ready. Ever. Period. You will never think you're good enough. Five months of hard training if you can not get tapped by purple belts and defend yourself without being dominated you're good enough for amateur ground fighting.
Second. Go to a local thai or boxing gym. Go spar. If you hold your own and land better shots against mid level guys there. Take a fight.
It's amateur fighting. So if you can hold your own in those two ways have at it. You have enough ability that it won't be a massacre to get in the cage with any semi trained fighter. You may win you may not but that's why it's amateur you just don't want to get hurt and if you can do those two things above you know enough to not get hurt.
Also just an fyi 270 is a little heavy to get to 205. Probably want to trim down some.
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