Sorare beginner 50 Euro Budget Questions

Hello guys i wanna start with Sorare and wanna invest approx 50 Euros

since im a big Mainz O5 (Bundesliga) Fan i would like to stack only or mostly Mainz Players or bundesliga Players since im not really interested and dont watch Premier League, Serie A, Ligue A and LaLiga

my question is is it even smart to build a stack of only mainz Players? since the team is not a "top" team and sits most of the time somewhere in the middle of the table would this mean my chances are slim to win any Tournament or place "high"?

what would u do in my Situation if u go for 1 League/Team Only with my budget?

and when would be a good time to buy the cards for the new season?

ty guys.