Seat Ibiza – Keep or sell?

At the moment I’m facing the annoyance of my Seat Ibiza 6L, BJ 2006, 145 tkm, service Complete with car gas (Prins) etc. In itself a super car, that’s why I bought it. Problem that bothers me at the moment or a little longer: In motorway rides I get a brutal Kotzreitz, because it does not come, except with kicks, over 150 kmh. (1.4L 16V, 75 HP) Before that I had a Golf V 1.6 FSI, which unfortunately had to leave because of a transmission damage. That went great for me, ha Now I am superior: 1. Is the performance or the driving behaviour normal for Ibiza that it is really so “lahm”? 2. Selling Ibiza and getting something “faster”? Add to this: Currently the value of Ibiza is about 4,000 euros with mileage, equipment etc. I would be willing to put something to it, but much is not possible as an apprentice. Then, of course, the question would be: Which car would be the most attractive in the budget?