Do you work in any specific sector in affiliate marketing?
I've done a but myself and as I'm sure you already know but some areas are quite hit and miss and some are prone to drop of all together.
When you say you are making the same as your full time job is that after advertising costs and tax etc? I would aim to bring in 2x your full time income and save up enough incase you hit a rough patch!
Also try and visit some conferences they are an invaluable source of info such as the af4u conference, see
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Hope it helps