When I got my Instrument I had about 150TT as well. I was also in your same position wondering how I can log the 100 hours. Here is how I did it. I filed IFR even when the weather was nice and flew some cross countries. I tried to go to places for a reason like meeting family/friends for a meal etc. I also just looked at a sectional, picked an airport and flew there. I also flew/shared a couple of cross countries with another pilot. I wish I had done it more. Finally I got a checkout on a Cessna 150 and built some serious VFR cross country time. The airplane is truly a great way to build time. I highly recommend you get some night flying. I also cannot emphasize the importance of getting some actual weather flying. Please do so with a CFI until you have the confidence. Be very conservative with personal minimums. Even if you couldn't find some suitable actual weather flying, still fly with a CFI under the hood and shoot some approaches. I started working on my Commercial once I hit a 190 hours. My goal was then to log 10 hours a month. The C-150 helped me do that. Good luck and keep flying as often as you can. You will get there.