Once your minimum term ends, you lose your initial discounts and you move to 'standard' pricing for your package.
There is little/no point trying to compare your VM package price with other VM customers. This is because VM aims to negotiate an individual price with each and every customer by forcing customers to renew via a sales agent who will try to upsell you the biggest/most expensive package that they can get away with. We see regular topics on here where a customer has found a friend/family member is on exactly the same package but paying a wildly different subscription for exactly the same services.
Perhaps more relevant is the price Sky (and all of the other competitor companies in your area) is offering for a comparable package of services.
If you are going to negotiate with VM to renew, that competitor pricing is the info you need at your fingertips. Once you have competitor pricing and VM's renewal pricing, only you can decide whether to move or not.