How do I use rnn to forecast to n periods with limited data?
there are 3 ways you can do this in NN -

1) take forecasted values ( horizon 1) and pass this again to built model to forecast next values ( horizon 2) and so on.

2) build a model with lagged values and have multiple output values( t, t+1, T+2... t+n). You need to decide window for lagged values.

3) use LSTM.