Generally I don't like 'trying to hit up on the ball' thoughts, but in your case it might not be a bad idea for a while. It helps to stabilise the putter head through impact a bit as well as square the face.
With respect to hitting at or above or below the equater of the ball, you have to think in terms of what loft you present towards the back of the ball.
Zero loft allows pure equater hits only,
Negative loft allows above equater hits only(exceptions from below),
Positive loft(as in 99.9% of putters that aren't delofted to a negative dynamic loft) allows below impact hits only.
Best to think in terms of dynamic loft!
Rise angle, which is the tracking of the putterhead through impact will affect where on the putter face you strike the ball, and through which axis of the ball you swing the putter.
A minimal positive dynamic loft with a rise angle that is slighter greater will impart the best roll IMO, if that is what you looking for. Very poor greens may require a bit more dynamic loft.
Don't try to futz around with your technique too much to achieve the better roll. The effects of better roll are typically not markedly better for holing putts than ensuring that your rhythm is consistent and your face angle is decent at impact.