Bit confusing, assumue your endowment is to mature next year but is your mortgage due to be repaid next yeat as well. If both you have left things a bit late to see advisor if there is a shortfall. If this is an old endowment being used against a new mortgage with longer to run there are more options open to you.
First thing to do is to get a surrender value on the endowment now and a projected maturity value a next year. If the difference is less than you will be paying in premiums there is no value to carrying on paying in.
One option therefore would be to surrender and immediately pay down the mortgage this would then reduce the interest payments, by keeping your monthly payments the same then adding what you would have paid to the insurance company each month you may just about repay the mortgage during the period. However not having any figures or time lines you really need to seek Independent Financial Advice.