You are asking the wrong question. It is not the number of schemes that is the issue here. You are currently investing in an IT sector fund. These schemes invest mostly in the IT sector and their fortunes depend entirely on the performance of the sector. Sure, these schemes performed well in the last few years but they can be risky due to their exposure only to the IT sector.

So, first thing for you to answer whether you would like to bet solely on the IT sector to achieve your long-term goal. If the answer is no, you should choose an equity scheme that matches your risk profile. For example, if you are a moderate investor, you should invest mostly in a flexi cap fund. Similarly a conservative investor should invest in large cap funds.

Now, your query about whether you can bet on a single scheme or should you have multiple schemes in your portfolio. There is nothing wrong in investing in a single scheme, especially when you are investing a modest amount of money. If you want to play it safe, you can add one more scheme. However, as said earlier, ensure you choose a scheme based on your risk profile. If you are not able to decide on your own, you can take the help of a reliable mutual fund advisor.