1 x 10 XT is OK, you may be able to get an after market cassette that gives you a wider spread of gears. If you can, I would keep that.
The wheels are OK, not the lightest or strongest but they’re OK, depends on your style of riding.
There are better forks out there than the Sektors and your frame can take more abuse than the forks. I would see about selling your Sektors on a well know electronic auction site and seeing what the money plus your £300 could get you. At least a set of Yari’s, if not Pike’s and possibly even an older set of Lyriks. Do the Cross-rides have boost hubs?