Please suggest an actual path forward, an actual plan that is more than just "figure it out". And the plan needs to address at least 1/2 of the points I made above.
It's a "Hard Problem". The answer needs lots of time, likely money and at least two humans with strong drive to fix the problem.
It's almost like it's not a technical challenge, it's that getting good looking icons would require a unified userbase, and Apple has that but Linux does not.
Finding money and designers is not really a hard problem.