[Bona]

IMO "moving up" need not be an abrupt transistion. Especially so since one of the top three considerations for whether playing at higher stakes level is a good idea is your confidence level.

My top three: Be a winning player. Have an appropriate bankroll. Be confident and comfortable(even during variance downswings.)

I recommend playing at a higher level a a minority of sessions and at your previously established "comfort level" a majority of sessions. You can play that way until you have established new comfort zones. I play at several levels myself and have found it is at least as much about my confidence as it is about my opponents skill level. Probably more.