I often end up using this tool;https://forum.renoise.com/t/snippet-convert-song-from-lpb4-to-lpb12/30227
In which you can *N the resolution of an existing song. It automatically expands the pattern sizes and stretches the content to fit (also auto-adjusts patterncommand & delay values etc) + adjusts lpb values accordingly. The only limitation is it won’t expand beyond Renoise’s pattern size limit of 512 + it can mess up existing automation editor envelopes -> so I always do the automation drawing after using it.
It is great imo for if you have sketched the main song structure, then want to have more resolution/pattern lines for more intricate programming.