Help substitute yarn

My knitting pattern is old and is asking for encore worsted. What yarn can I substitute? Thanks for your help

Yarnsub is a good place to look, it will gives some suggestions for a close match or you can filter for budget, yarn fibres etc.
Here’s a link

Or you can look for another worsted weight yarn you like with the same gauge. Make sure to check how many meters or yards you need for your project rather than number of balls as balls of different yarns have different lengths.

Hope this helps