Its easy....just be realistic with yourself. Stop dreaming of projects that will never happen and start enjoying the stuff you actually ride. Or, build the bike you want, not the 30 that are just ok and cluttering the shed!
"Stuff" is appalling for your mental health, it bogs you down, makes you feel guilty and pretty quickly when it reaches a critical mass, stops you enjoying your hobby.
Having shed 30 years + of "stuff" over the last 4 years...600 items and counting, I now feel so much more engaged. I'm riding more ( rather than standing looking in a stunned trance) and have enjoyed the projects im working on far far more. Clarity of thought...
Yes, ive got spares....yes ive got parts for some future builds, but that totals 40 items.
Plus, I've been able to use the cash to upgrade my bikes to the degree i want, pay the restoration costs on another and buy a few really nice bits of kit I've always wanted....nos mavic rims for example, without guilt, without worry and knowing they have a use, rather than being more " cupboard filler".
Just start....that's all you need to do.....the rest will follow.