Don’t pay this! You just reinforce their predatory practices. How renewals at much higher prices are allowed - no clue!
Something similar happened to a company I know - it expired and was immediately bought by domain squatters, when they found them they were told that it couldn’t be sold back because the squatter had paid $XXXX for and had big plans (I assume it was BS, just a premise to get paid - no site was ever put on the domain)
Solution: they bought the .org version and bought the .com back a year later.
edit:grammar
I have tried freecad a number of times to replace solidworks as a critical piece of closed source software in hardware development toolchains. I have always struggled. Yesterday someone spent an hour with me at a makespace saying… “FreeCAD has a different way of doing this/try realthunder branch/use symmetry condition/delete all conditions that coincide” … it has been worth years of trying alone. When I started solidworks the reseller gave me a week of training - this is often why complex FOSS software gets a reputation for being clunky, because alone you will spend ages hunting a GUI button in a complex interface.
TLDR: Go outside, go to makespace or a FREECAD conference - meet other people who use open source software - its much easier to use/learn from others than alone.