I then bought a leaf suit thinking my camo was the problem and thought it’d be some sort of invisibility cloak but it wasn’t that either.
As someone who has done the whole ghillie sniper thing since before it was cool (ah, dyed hessian my not-beloved...), I find a lot of ghillies these days are actually really crap because they rely on the suit to keep them hidden. I actively try to not use mine sometimes just to make sure my fieldcraft stays sharp. It helped me a lot last weekend because I managed to stand in some thick ferns and take potshots at a bunch of players who had no idea I was there, and I was simply wearing an olive t-shirt and ballcap but had chosen my position well, was only moving when they weren't looking in my direction, and kept any small movements like pulling back the bolt very slow and deliberate. Someone with good fieldcraft in regular DPM will hide far better than someone with a fully-crafted-over-engineered-bush-suit with no clue how to use it. (yes, I am not a fan of these all encompassing bush suits that make you look like a bog monster)
I am sure some DMR mains on here would be able to recommend a decent DMR.
Not a DMR main, but definitely a long gun with MED main so I'll give it my best shot (I use both bolt actions and DMRs)
Cyma Platinum SR-25 is pretty good for an AEG DMR. It's a proper DMR platform, so you can take it to milsims and battlesims that may require that, and all you really need to do is change out the hop and then whack a more powerful spring in it as they're built to deal with higher power and are just downgraded when they come into the UK. Semi-auto conversions are pretty easy too.
Or go to the (expensive) dark side and get an MTW-308. They're incredible DMRs, but they're also HPA so that's an external line and tank, or you get the unleashed version and use a 13ci tank as the stock (only really works if you're careful on the trigger; shoot too much and you'll run out of air), or the co2 adapter if you want it to look more realistic (but then you have to change co2 bulbs every so often)
I wouldn't recommend GBBR DMRs as a first one. They're very fussy, and I'd get a regular GBBR first before getting one as a DMR so you can learn how they work. Gas cooldown is a thing, and a GBBR DMR will never be as consistent as an AEG or HPA DMR purely because of the way they work. These inconsistencies can be minimised to the point where the difference is meaningless from a practicality point of view, but they're still there. However, they are a lot more fun. For GBBR DMRs though, VFC do a number of decent platforms, or you can get a TM MWS and convert it to be a mk12. WE-based GBBR DMRs are just not as worth it in my opinion, which is a shame because they do some pretty unique models; they're the only company that do a GBBR SVD or m14 for example, and I love my m14 but by God is it fiddly and fussy...