Was there a better more viable option for Napoleon than invading Russia?

This depends on what you think Napoleon's ultimate goal
was and what time frame could be allowed for that goal to be reached.  There were
certainly better options unless the goal was total
domination of Europe and the time frame was very short.

If
Napoleon could have settled for less than total domination of the continent, there would
have been no need to invade Russia.  Russia was not threatening him.  Instead, it was
simply not helping him as much as he wanted.  He could surely have gotten more help by
diplomatic pressure on Russia.

If Napoleon could have been
more patient, diplomatic pressure could also have gotten him domination of Europe.  His
armies were the strongest on the continent and he could have gradually forced Russia to
do what he wanted using economic and political pressures.

I
would argue that Napoleon should have used economic and diplomatic/political pressure to
get Russia to do what he wanted.  But if the goal was to get total domination of Europe
ASAP, invasion was the only possibility.