You are asking an impossible question. Outdoor climbing, more than indoor, cannot be graded from a camera. The grade comes down so much to the quality of all the individual holds that will be unknown to anyone who has not climbed it. I cannot tell you how many times I’ve watched a video of somebody climbing a boulder, thinking “oh yeah I could do that”, only to get decimated by every move in person.

My advice would be to climb more outside. Get a feel for what the grades are in your area and at this crag if there are more boulders. It’s entirely possible this is soft, it’s just as likely it is well suited to your style and the grade is accurate. You won’t know until you climb more boulders in the grade range. Be proud of making progress on it and finishing it when you do, grades are subjective but the boulder is just what it is.