How can I make my yugioh Karakuri deck better?

If it were me, I would take out the Heavy Mech Support Platforms, put in more Cash Sheds, Solemn, Mirror Force (Mirror Force and Solemn both come common in structure decks now, if you don't already have them) and Instant Fusion (Use Cyber Saurus for Instant Synchroing). I would also take out the Nanashak, because he (in my opinion) isn't worth the tribute. I would take out Starlight Road, because it is a little too situational to be of use all the time. Maybe add more Merchants for the searching power. Try another MST over Forbidden Lance. Hopefully this helped to make your deck a little more consistent.