Experienced controller is needed for the calculation for the potential sales volume of a web based software

Our company has developed a web based cabinet maker tool:
https://couchinthewoods.de/wp-content/web-cabinet-maker/

The release is planned in about 6 months.
We need a rough estimate of how many versions can be sold per month for a time frame of 2 Years.
The monthly marketing budget should be about 15,000 USD.
The software will be available in 8 languages (german, english, spanish, french, italian, portugal, polish, dutch).
The target group is carpenters and furniture makers.
Buyers of the software will get their own subdomain, for example company-xy.mregio.com.
The price will be 2000 USD including lifetime updates, plus 100 USD hosting fees per year.