What to do with non-performing Mutual funds and re-invest into better funds

I have been investing in MFs since 10 years but now, I am facing a situation where one of my funds SBI Magnum Tax Gain Growth is not performing well since 3 years. Been patient enough for the fund to improve it's performance but to no avail. So, I am contemplating to redeem and re-invest in some other multicap/diversified equity fund. Please guide me to resolve my confusion. I have - 3 ELSS Funds (ABC'96, Axis LT Eq, Rel Tax Saver) - ongoing SIPs, Mirae Asset Emerging Bluechip Fund - ongoing SIP, SBI Magnum Tax Gain Growth - No SIP. All units can be redeemed. HDFC Tax Saver - No SIP, HDFC Top 200 - No SIP. SBI Magnum Tax Gain is not performing well since past 3 years. So, I want to redeem (all the corpus Rs. 6 lakhs) and subsequently invest in existing ELSS or buy new Multicap Fund. My questions are - 1. Should I invest in existing ELSS (ABC'96/Axis LT Eq) or a new Multicap fund? (Do you think that ELSS Funds, because of their 3 years lock-in, give additional freedom in comparison to other multicap funds for the fund manager to take long term calls eventually translating into better performance? Note - I do not need this money for next 7-10 years.) 2. Should I redeem in one go or in parts (say, 3 nos) from SBI Magnum Tax Gain and then re-invest that money? 3 As of now, SBI Magnum, though a diversified equity fund, has more (approx 70%) Large Cap exposure. If the ELSS or Multicap fund has more Mid-cap exposure. (eg. ABC'96 has approx 50% exposure), do you think it makes sense to invest via SIP (6-9 nos.) or should I invest lumpsum without worrying too much about Mid-cap exposure and volatility because I do not need this money for next 7-10 years?