Base on the question, it is very obvious TS is a beginner, starter.
You can try 0.8, 0.85, 0.9, 1, 1.1 etc etc, imo regardless, they are just guides, it is too insignificant to know the exact number for now. But, follow the one that is practical and
sustainable in at least a year before looking in to specific number. Don't pay too much attention on small number, over calculative, over complicates stuffs, and did it for few months then give up because it is just too big jump and too harsh.
Eventually, you'll know your number, just, start from small change.
There are 2 package of practice
1. You can go as f hard as calculate everything, min maxing everything and get burn out after 1 year
or
2. Start by know your eating habit and switch a bit here and there and do it for 50 years.
To know your ref number, you can
https://www.iifym.com/