Help deciding on getting an upgraded LGA1150 Mobo for more RAM or building a new PC with DDr4/8700K

Trust me, I keep it open along with Open Hardware Monitor and Realtemp all day, every day on my second monitor. 16GBs isn't great. Gaming alone ends up running it up to and usually way over 60-70% (RAM/Memory) let alone having anything else run, such as chrome, or even when I'm not gaming, and running a bunch of VST/VST instruments that are over 100GBs a piece in their midi libraries. Just watching anime in VLC player eats up half of my RAM, without Chrome or anything else. That wasn't my question, "knowing if I need 32GBs". That I know is obvious. Lol I know what I need, I just don't know if it's worth investing more money into upgrading an older gen system when I can spend it on building a better system, virtually cheaper, I just really don't know, tbh because I've never dealt with DDr4 and I'm literally the only person out of anyone else that I know, that even understands any of this. So, I must resort to the internet, how I've learned everything I know. I just don't wanna waste 350$ on a new LGA1151 Z370 board, along with almost 400$ for the CPU, and another damn near $400 for 32GBs of DDr4 RAM. Not counting another version of Windows 10(Which I'll have to get regardless, obviously). Lol I mean, if it's going to be worth it in the end, I don't mind. It's going to take a couple months to get all the money up for it. But if I'm going to be disappointed I'd rather just stick with what I have and pay the cheap 300$ for a new lga1150 board because it's the best of its kind that's available and that's new not used. I mean, I kind of want to go the z370 route because, in the long run, I can double the ram. And within a few months have twice of what I could with this, plus the benefit of a better CPU. But I feel like I'm going to end up just barely noticing any difference if at all in the actual improvement of my performance. I mean, looking at other videos of benchmarks and other tests done, the 8700K blows away my 4790. But at the same time, most games can't even utilize most of its power and it all comes down to being able to use those extra cores for multitasking for music production, having to run so many VST's and VSTi's through a bunch of different software and using rewire to work with different DAW platforms within my main DAW. But I feel like I'm just letting my current CPU just literally sit in a box collecting dust that I just wasted 450$ on altogether 2 years ago. I just don't wanna waste all the extra money building an entirely new system if it's not going to make a difference. And trying to find direct answers to my particular question isn't so clear online. It's usually always about the K version comparing, and no one really gives any actual advice other than, "not really worth upgrading, you still have a good system". Like, lol I get that, but it can always be better. And being limited to only 2 8GB ram DIMM slots is beyond frustrating. Not to mention my current mobo only has 1 PCI-e x16 slot with 3 x1 slots(which one is covered by the GPU). Only 4 SATA ports, and 6 USB ports altogether. It's weak asf. Which is totally my fault for being such a lazy noob when I had the chance to build my own PC from the start but chose not to and went to worthless Walmart to buy a prebuilt OEM. So I already wasted almost 600$ for mostly everything to also just sit on my shelf collecting dust lol. I'm just tired of wasting money just to end up having to get something better in a few years when I should just put the money up the first time. Hense, why I'm asking if it's even worth it in the first place. I've never personally dealt with DDR4 RAM or anything better than my crap LGA1150 HP. It was my best PC to date, and I basically tore it apart to make it as good as it can get, but I'm still so limited. Apologies, for the storybooks. Smh. Lol, I'm just really conflicted at the moment. And I feel like either way I'm going to feel like I probably did the wrong thing. Clarification is all I seek. Lol, I just don't wanna get the LGA1150 board upgrade, and then end up buying an entirely new system in a year because of some game or software that's demanding ddr4 or more RAM in general. Which is most likely what's going to happen anyway. Then after all is said and done, the next best thing will come out anyway, and I'll end up being behind again. I mean I finally just got a GTX1080 and my rig is still lagging like my ram was maxing out earlier over 80% just playing random games trying to compare the visual difference from my GTX960. Which is honestly hard to even tell on most games! I feel like I just wasted 700$ on it and games like GTA5 and others barely look any better, at all. And my monitor is the only 1080p@60hz, so I should probably eventually get a better primary monitor more for gaming. It's a 27 inch Acer that I bought on sale at Best buy for like 175$ because I wanted the extra screen real-estate to be able to spread out my VST plugins better in my DAWs instead of them taking up so much space. But I don't know, I just wanna know if I should grab this outdated LGA1150 board while it's still there before it sells out and then this is literally the last of the decent mobos left for my current CPU that isn't used. Which I refuse to pay for something that someone else probably jacked all up lol. I've seen it happen countless times to people, I'd rather not even take the chance.