Ok, so it looks like a QR fork, probably an older model than the one currently on the website. Your best bet would be a different QR skewer, either a Shimano or one with an allen bolt.
Swapping the fork will be expensive, compared to the cost of the bike; you will need at least new forks, new hub (I doubt the one you have is convertible to 15mm), new spokes, front wheel re-laced. If the fork steerer is straight, a new 120mm 27.5 fork will be even harder to find, so you’ll probably settle for a tapered steerer fork; then the frame might or might not take a bottom EC44/40 cup (more money) to allow you to use a tapered steerer.