Ahh yes that's your Bobcat trail 3 isn't it.
Couple of issues - your fork looks to be a straight steerer so you'll need a different bottom headset cup, and your fork is QR - anything decent will be bolt through, 110mm x 15mm, and unless your hub can be converted (which is highly unlikely), you're looking at a new hub being laced to your wheel, or a new wheel.
Marzocchi Bomber Z2 would be a great fork and a massive upgrade over the coil sprung SR suntour, but you're probably looking at a new wheel, plus getting the lower headset cup pulled out and a new 44mm external cup pressed in.
I would highly recommend going tubeless (if those tyres are tubeless ready) and fitting a dropper post. Once you start riding stuff where you need to corner properly (i.e. leaning the bike underneath you) a dropper makes things 100x better. A Brand X can be had for £140 or £170 depending on the travel.