The thing is, that it is difficult to win. (almost) Everybody wants to win. Some nations have a slightly better chance(Ukraine, Sweden, Italy), some have a slightly worse chance(San Marino, Malta, UK
) Czechia is right now at the underside of the middle group I think. So the chance is about 1/50 every year you will win. So the chance you win the next 3 years is about 6% When we talk about 50 years, it's about 63%.
So honestly, just send in good songs and have a lot of fun. Try to be a member that gets into the final 8 out of 10 times and don't expect to win every year. To be a Sweden/Ukraine/Italy, you need a big following in your country with a national final, you aren't. To be more like Netherlands, you need to qualify a bit more often, which is definitely possible, but at the end it comes down to luck.