FE willtell you that the forum does not permit the offering of financial advice. Hopefully some very general comments will be permitted.
It is impossible to provide an answer without knowing your personal circumstances. However, if you have paid in over a long period you will have seen gains, while now experiencing significant retrenchment.
If you do not need access to the funds now, it might seem unwise to cash in at what might be a low point. The advantage of making regular contributions to a fund (pound cost averaging)is that when values fall you are purchasing units more cheaply. This pays off if and when the fund recovers. Markets will recover but maybe not in the near future and a tracking fund is less exposed to the failure of a few companies (eg banks) than some specialised funds. I do not think it would be foolish to continue to invest if you have adequate cash flow, prepared to take some risk and are able to take a long term view, say five to ten years.