Instead of actual numbers, you could use "first of all", "secondly", etc.
Fifthly (or any final thing in the list) would be interchangeable with
Finally in the below example.
You could use semicolons or comma-separated lists. The below example uses semicolons:
There were a few factors to keep in mind when going about the benefit cost analysis: First of all, technologies that were going to stay; secondly, those that were going to stay but be upgraded. thirdly, things that were going to come to the new house; fourthly, technology that will be taken to the new house and upgraded; finally, things that would be disposed of.