Yeah in the 14 years I was into it selling a complete was almost impossible. People just want to build it up themselves in their way which is quite understandable.
Which is why I got what I consider to be hardly anything compared to what I had spent. That said they were like a noose around my neck and I knew one day if mum went before me I would be totally and utterly screwed. So I just thought of something I wanted (a graphics card for my PC) and just let go.
Your stuff will be easier to sell though dude. Mid school stuff is very hard to sell. Also, things are totally on your side because Ebay is now basically empty. For mid school? there was basically nothing left to buy. Even the Facebook groups just completely dried up. I suppose when you have 15 years of high demand then eventually you will literally run out of things to find. That was another thing for me. The last couple of bikes I wanted to build would have cost me ridiculous amounts of money as they are all now in the hands of hoarders and collectors and you know how that is? basically you have to give them that dumb ridiculous price in their head or they simply won't sell it. Gone were the days of finding frames for £100 as they are all gone and people now want £500+ for them.
I did keep 4 which in fairness is 3 too many

but two of them especially were bikes I owned, rode and loved. Oddly they were the least valuable but as I learned then money doesn't buy you a bike you love riding. You get one that feels right... Which is what happened to me. I adored my Schwinn and I then got greedy and basically ruined things. Bike was continually in bits being messed with rather than ridden and enjoyed.