Focus on building time potentially any way that you can, whether that be flight instruction or something else. I highly recommend that you get your flight instructor ratings if you are close. If you want to instruct the whole way to 1500 hours, then do that following your desire. There are also other ways of earning your flight time as well, so don't discount them if that is what you want to do. I instructed for a while, then was hired on with a part 135 VFR operator at over 500 hours. I don't regret it, since one can learn more by having done both. There is great value in diversifying oneself.