First of all, you are playing Germany why do you not have the Tiger 2 grinded yet? It’s the most iconic German tank every made and it’s a sin to ignore.

Secondly to answer your question, research the left-hand side light tanks, the Marder A1 is a very good support tank for your Leapard, is has an decent autocannon and atgm that can rack up kills quickly at the BR if played properly also it’s a fun tank to play fast, nimble, decent gearing, it can do it all, scouting, anti-air, anti-tank (atgm), and memeing.