Tips for upgrading a small server's hardware

Hey guys,

I'm currently hosting a Paper/Geyser server on a raspberrypi 3B (1Go RAM) and it's getting very limited.

I plan to have a maximum of 5 players at the same time, which is not possible with this setup. I was thinking of going with a raspberrypi 5 to mitigate the issues related to RAM capacity, but I guess I could get better hardware for the same price if it is not miniaturized (~ 130€).

Power consumption is what matters the most for me, as I do not plan on scaling the server further, what do you guys recommend ?

Thanks in advance for your advice :D