Your best chance to get into F1, even if it is just for 1-2 seasons.
Mercedes seems to be very picky and even then, it can be hard to reach F1.
Ferrari academy is stacked, a lot depends on what happens at Alfa and Uralkali F1 team in the future. Certain names might have preferential treatment.
Renault/Alpine, very difficult without them having a B-Team/sister team or customer team.