1. Never Hold Mutual Fund Units in Demat Form!
One of the common activity we do as part of investment is to reduce maintenance costs. Having MFs in demat format, not much difference it make with respect to use. But your DP might be charging AMC or some other charges periodically which increases your maintenance without much value add.
2. Spread your investment across the options
Consider options like equity, MFs, Debt, reality, gold, Pension etc.