How much a 10 YOE SAP FICO Functional Consultant expect while switching ?

Depends on your current CTC. Start from 100% if you are underpaid otherwise ask 50%. Once you get any offer then you can negotiate

Yoe*3 is what you should try for. So 30lpa. Companies like tcs will try and scam you saying yoe*2 is standard, etc etc. But those are 2005 standards. Don't listen to them. Yoe*3 or above should be your target