since 2 months cold start not possible anymore!

Good morning Mini friends. You’re my last hope… I can’t start my mini cold for two months now. Try the first five to ten starts he spins a little bit slowly but from the 10 times he spins faster he sounds like he’s just about to start! Can’t start, but I’ve already emptied the whole battery. Once started I can turn it off and leave it right away without a problem. Battery ok, candles spark okay. r inject in air intake tube no effect! The two gasoline pumps hum under the rear back seat, so I assume that they work. From 24 degrees outside temperature it starts the first kick. As added below, I already had the thermostat, thermostat sensor and the gasoline high pressure injection pump replaced. Please help me!