Start again!!! Why??? You already have been solo before as far as I am concerned that is 2/3 of the way through the course.
My advice is block book an instructor in the UK in the week (good aircraft availability). The weather can be good enough to finish quickly, even in the UK, provided you book sufficient slots.
Book 1 flight a day and accept the crappy weather as being a day off.
Just going back in the circuit you will be doing take/off, climbing, climbing turns, straight & level, medium level turns, speed control, use of trim, descents with/without power, with flaps, landings, RT, decision making etc, etc. Blimey, it's no wonder circuits are hard at first
Your instructor will be able to spot straight away the bits you are rusty with.
The good thing is that you have done the exams and have given yourself a deadline of 18 mths to get the PPL done this time.
As regards to weight/balance, fuel calcs, passenger briefs you would have just about started doing that when you got onto X/C flying.
What to do after your PPL? Just get your PPL and worry about that afterwards. Take one step at a time.
Happy Flying.
FIS.