Also, an investor should not look at just returns but the Volatility of the Fund using SD.
If you are ready to accept higher SD for higher returns then you can go ahead and change funds.
Also, keep in mind that, today’s leaders are generally tomorrow’s looser.
Similarly last few years underperformer could be today’s winner.
Hence, you need to select funds based on your risk appetite, SD, Alpha, Fund Management corporate governance, and few other parameters and stick to those funds for longer time to deliver, else too much churning may not yield much benefits but you may end up paying frequent taxes.
I may be wrong in my analysis and observations.
I have changed my approach after 10-12 years of my mutual fund investment journey and I focus more on my risk appetite and financial goals rather than looking for 4 and 5 star funds. This has given more stability to my approach. This will not suit all, as this is more suitable towards your retirement or later part of career or later part of investment journey!! During initial years, you should experiment more and find what is suitable for you.