MacBook Pro 13 “ 2014 8gb ram

Since this model's RAM cannot be upgraded as it is integrated onto its logic board, your only choice is to run fewer apps, especially memory-intensive ones, concurrently.

However, there may possibly be other issues that is causing this error. As such, I suggest that you run an EtreCheck report, and optionally, post it here if you need assistance with interpreting its results.

Ref: Using EtreCheck to Troubleshoot Potential… - Apple Community

If you only have 8GB of RAM installed, that is minimal and not really sufficient for the more recent operating systems. You can regularly restart your Mac and periodically clear out the browser's history. Last, it helps to keep the number of open windows/apps to a minimum.