That is a call that you need to take. Frankly, there is not much benefit in having multiple demat accounts unless it is statutorily required. Otherwise, there is no limit on how much value of shares you can hold in a demat account.

Also, there is no limit on what all assets you can hold in a single demat account! There is, of course, one case in favour of multiple demat accounts. When you are a trader and an investor, it is quite convenient to have your trading transactions with one trading account and investment transactions with another account. This helps you to segregate the trading portfolio and the investment portfolio when separate demat accounts are maintained for the same. This is just for convenience and filing your tax returns and furnishing proof becomes much easier. That is all!