Personally, if you're not really short on cash I would start again. When I got my allotment there was a mass of unknown raspberries growing all over the place. I spent quite a while digging them all up and getting rid of them. Then I bought enough summer and autumn raspberries for two rows, each about six meters long. I used weed membrane in between the rows to reduce the need to weed. I bought the raspberries as bare root plants, which you will be able to get either now or on order for later in the autumn/winter, and they should be very cheap. I think in total my two rows cost something like £20-30 (I think that was for something like 10-12 plants per row), which considering they may stay productive for ten, fifteen or more years seems very good value to me. It also meant I got the varieties I wanted to better spread out the season and ensure I got tasty varieties. A few plants didn't establish but I got them replaced under guarantee. I bought them all from Ashridge Nurseries (no affiliation). Later on I also got a couple of unusual varieties from Lubera (a purple and black raspberry), but they can't deliver to UK customers anymore because of Brexit.