Let me illustrate this with a little dialogue I made up:
Hmmm.....interesting idea....but let's face it, we both have not really all the insights how Brussels works, right?
What I know is that the EU parliament is a good mirror of the politics in its member countries....means they are all there, nobody is clearly forced to stay out. You are eligible to get voted for in your home country, you are eligible for Brussels!
Then there are these fractions...groups with common ideas, and yes, also common interests are able and invited into fractions, where your party finds like minded politicions from across Europe....with the goal to support and strenghten each others cases!
After last sunday they look like this:
Polish parties are everywhere:
ECR - European Conservatives and Reformists Group 27PiS Prawo i Sprawiedliwość (razem z Suwerenna Polska i Republikanie) 25
SP Sovereign Poland 1
SPZZ Solidarna Polska Zbigniewa Ziobro 1[/i]
EPP - Group of the European People's Party (Christian Democrats) 16PO Platforma Obywatelska 1
PSL (Coal. KE) Koalicja Polskie Stronnictwo Ludowe 2
Ind. (Coal. KE) Independents 3S&D - Group of the Progressive Alliance of Socialists and Democrats in the European Parliament 7NW Nowa Lewica 5
SLD Sojusz Lewicy Demokratycznej - Unia Pracy 1
Ind. Independents 1
Renew Europe - Renew Europe Group 1Polska 2050 Polska 2050 1
NI - Non-attached Members 1Ind. Independents 1results.elections.europa.eu/en/national-results/poland/2019-2024/outgoing-parliament/
So....first I would look which faction would be right for me and my party....there I would find surely people agreeing with me, and then the work begins...making plans, detailing, building a stable, legal proposal....looking for supporters in other fractions....making deals and compromises...."scratching other peoples backs so they will scratch mine"...the whole drill the same as at home...more or less!
You are not really alone, and not only one politician (from...say...Germany) decides over your wish to change something....you start with your politicial group and when you find enough support in other groups you will get the needed votes to make your proposal real, if not then not.
I'm not so sure how to make that system better, Iron...