You will get good benefit from just repeating the plan you have. No need to buy another one. You can certainly shorten the transition period of that plan by dropping the firs few weeks. Normally we recommend that you increase the training load on each subsequent training cycle (time you have run through the plan). How much to increase the volume is going to depend on how well you managed with the volume the fist time through. If it was very easy then a bump of even 20% can be in order. For most folks a jump of 10% is more reasonable. Only you can know this and I recommend looking closely at the notes you kept in Training Peaks to help you get an idea of what load you handled and what load taxed you too much.
I’d finish off the next 4 weeks of your plan in any case.